The quantum gravity seeds for laws of nature |

from physics.hist-ph by Vincent Lam, Daniele OritiFri Apr 19 2024 10:13:01 (1 day)# 1.

arXiv:2404.12248v1 Announce Type: new Abstract: We discuss the challenges that the standard (Humean and non-Humean) accounts of laws face within the framework of quantum gravity where space and time may not be fundamental. This paper identifies core (meta)physical features that cut across a number of quantum gravity approaches and formalisms and that provide seeds for articulating updated conceptions that could account for QG laws not involving any spatio-temporal notions. To this aim, we will in particular highlight the constitutive roles of quantum entanglement, quantum transition amplitudes and quantum causal histories. These features also stress the fruitful overlap between quantum gravity and quantum information theory.

from quant-ph by Tobias HaasFri Apr 19 2024 10:12:44 (1 day)# 2.

arXiv:2404.12320v1 Announce Type: new Abstract: The area law-like scaling of local quantum entropies is the central characteristic of the entanglement inherent in quantum fields, many-body systems, and spacetime. Whilst the area law is primarily associated with the entanglement structure of the underlying quantum state, we here show that it equally manifests in classical entropies over measurement distributions when vacuum contributions dictated by the uncertainty principle are subtracted. Using the examples of the Gaussian ground and thermal states, but also the non-Gaussian particle state of a relativistic scalar field, we present analytical and numerical area laws for the entropies of various distributions and unveil how quantities of widespread interest such as the central charge and the (local) temperature are encoded in classical observables. With our approach, quantum entropies are no longer necessary to probe quantum phenomena, thereby rendering area laws and other quantum features directly accessible to theoretical models of high complexity as well as state-of-the-art experiments.

from PRL by Harry E. Dyte, George Gillard, Santanu Manna, Saimon F. Covre da Silva, Armando Rastelli, and Evgeny A. ChekhovichFri Apr 19 2024 06:00:00 (1 day)# 3.

Author(s): Harry E. Dyte, George Gillard, Santanu Manna, Saimon F. Covre da Silva, Armando Rastelli, and Evgeny A. Chekhovich

The measurement problem dates back to the dawn of quantum mechanics. Here, we measure a quantum dot electron spin qubit through off-resonant coupling with a highly redundant ancilla, consisting of thousands of nuclear spins. Large redundancy allows for single-shot measurement with high fidelity ≈99.…

[Phys. Rev. Lett. 132, 160804] Published Fri Apr 19, 2024

from philsciThu Apr 18 2024 06:40:22 (2 days)# 4.

Davis, Cruz (2024) Non-Spatial Matters: On the Possibility of Non-Spatial Material Objects. UNSPECIFIED.

from philsciThu Apr 18 2024 06:39:21 (2 days)# 5.

Margoni, Emilia and Oriti, Daniele (2024) The emergence of spacetime: what role for functionalism? [Preprint]

from physics.hist-ph by Henrique GomesWed Apr 17 2024 12:35:15 (2 days)# 6.

arXiv:2404.10461v1 Announce Type: cross Abstract: In general relativity, the strong equivalence principle is underpinned by a geometrical interpretation of fields on spacetime: all fields and bodies probe the same geometry. This geometric interpretation implies that the parallel transport of all spacetime tensors and spinors is dictated by a single affine connection. Can something similar be said about gauge theory? Agreed, in gauge theory different symmetry groups rule the interactions of different types of charges, so we cannot expect to find the same kind of universality found in the gravitational case. Nonetheless, the parallel transport of all the fields that are charged under the same symmetry group is dictated by a single ‘gauge connection’, and they all transform jointly under a gauge transformation. Is this kind of ‘restricted universality’ as geometrically underpinned as in general relativity? Here I argue that it is. The key difference is that the gauge geometry concerns ‘internal’, as opposed to ‘external’, spaces. The gauge symmetry of the standard model is thus understood as merely the automorphism group of an internal geometric structure — $C^3\otimes C^2\otimes C^1$ endowed with an orientation and canonical inner product — in the same way as spacetime symmetries (such as Poincare transformations), are understood as the automorphism group of an external geometric structure (respectively, a Minkowski metric). And the Ehresmann connection can then be understood as determining parallelism for this internal geometry.

from philsciTue Apr 16 2024 23:51:23 (3 days)# 7.

Ryder, Dominic J. (2024) The Black Hole Idealization Paradox. [Preprint]

from philsciTue Apr 16 2024 23:50:25 (3 days)# 8.

Barrett, Thomas William and Manchak, JB (2024) On Coordinates and Spacetime Structure. [Preprint]

from philsciTue Apr 16 2024 23:48:01 (3 days)# 9.

Baron, Samuel and Le Bihan, Baptiste and Read, James (2024) Physical Theory and Physical Possibility. [Preprint]

from philsciTue Apr 16 2024 23:44:53 (3 days)# 10.

Feintzeig, Benjamin (2024) Quantization and the Preservation of Structure across Theory Change. [Preprint]

from nature-physicsMon Apr 15 2024 20:00:00 (4 days)# 11.

Nature Physics, Published online: 16 April 2024; doi:10.1038/s41567-024-02488-yEighty years on from the publication of Erwin Schrödinger’s interdisciplinary analysis on the origin of order in living organisms — What is Life? — we look at how physicists and biologists are approaching the topic today.

from philsciSun Apr 14 2024 17:10:12 (5 days)# 12.

Del Santo, Flavio and Gisin, Nicolas (2024) Creative and geometric times in physics, mathematics, logic, and philosophy. [Preprint]

from philsciSun Apr 14 2024 17:10:07 (5 days)# 13.

]]>Ellerman, David (2024) A New Approach to Understanding Quantum Mechanics: Illustrated Using a Pedagogical Model over Z2. Applied Math, 4 (2). 468-494..

The classical-quantum hybrid canonical dynamics and its difficulties with special and general relativity |

from gr-qc by Lajos Di\’osiFri Apr 12 2024 14:58:09 (18 hours)# 1.

arXiv:2404.07723v1 Announce Type: new Abstract: We discuss the Hamiltonian hybrid coupling between a classical and a quantum subsystem. If applicable to classical gravity coupled to quantized matter, this hybrid theory might realize a captivating `postquantum’ alternative to full quantum-gravity. We summarize the nonrelativistic hybrid dynamics in improved formalism adequate to Hamiltonian systems. The mandatory decoherence and diffusion terms become divergent in special and general relativistic extensions. It is not yet known if any renormalization method might reconcile Markovian decoherence and diffusion with relativity. Postquantum gravity could previously only be realized in the Newtonian approximation. We argue that pending problems of the recently proposed general relativistic postquantum theory will not be solved if Markovian diffusion/decoherence are truly incompatible with relativity.

from quant-ph by Kaumudibikash Goswami, Giulio ChiribellaFri Apr 12 2024 14:58:00 (18 hours)# 2.

arXiv:2404.07683v1 Announce Type: new Abstract: We introduce two quantitative measures of the strength of causal relations. These two measures capture the maximum and minimum changes in a quantum system induced by changes in another system. We show that both measures possess important properties, such as continuity and faithfulness, and can be evaluated through optimization over orthogonal input states. For the maximum causal effect, we provide numerical lower bounds based on a variational algorithm, which can be used to estimate the strength of causal relations without performing a full quantum process tomography. To illustrate the application of our algorithm, we analyze two paradigmatic examples, the first involving a coherent superposition of direct cause and common cause and the second involving communication through a coherent superposition of two completely depolarizing channels.

from PRL by Stefan Antusch, Admir Greljo, Ben A. Stefanek, and Anders Eller ThomsenFri Apr 12 2024 06:00:00 (1 day)# 3.

Author(s): Stefan Antusch, Admir Greljo, Ben A. Stefanek, and Anders Eller Thomsen

We posit that the distinct patterns observed in fermion masses and mixings are due to a minimally broken U(2)�+� flavor symmetry acting on left-handed quarks and right-handed charged leptons, giving rise to an accidental U(2)5 symmetry at the renormalizable level without imposing selection rules on …

[Phys. Rev. Lett. 132, 151802] Published Fri Apr 12, 2024

from PRL by Reza Javadinezhad and Massimo PorratiFri Apr 12 2024 06:00:00 (1 day)# 4.

Author(s): Reza Javadinezhad and Massimo Porrati

We describe and solve three puzzles arising in covariant and supertranslation-invariant formulas for the flux of angular momentum and other Lorentz charges in asymptotically flat spacetimes: (i) Supertranslation invariance and covariance imply invariance under spacetime translations; (ii) the flux d…

[Phys. Rev. Lett. 132, 151604] Published Fri Apr 12, 2024

from physics.hist-ph by Flavio Del Santo, Nicolas GisinThu Apr 11 2024 11:52:20 (1 day)# 5.

arXiv:2404.06566v1 Announce Type: new Abstract: We propose a distinction between two different concepts of time that play a role in physics: geometric time and creative time. The former is the time of deterministic physics and merely parametrizes a given evolution. The latter is instead characterized by real change, i.e. novel information that gets created when a non-necessary event becomes determined in a fundamentally indeterministic physics. This allows us to give a naturalistic characterization of the present as the moment that separates the potential future from the determined past. We discuss how these two concepts find natural applications in classical and intuitionistic mathematics, respectively, and in classical and multivalued tensed logic, as well as how they relate to the well-known A- and B-theories in the philosophy of time.

from PRA – fundamentalconcepts by Shubhayan SarkarThu Apr 11 2024 06:00:00 (2 days)# 6.

Author(s): Shubhayan Sarkar

The work challenges the concept of “classical independence” between physical systems by demonstrating that within quantum theory two systems can affect each other despite no observable changes, unveiling the interconnected nature of the quantum world. The findings also unveil potential applications for device-independent certification of quantum states and measurements.

[Phys. Rev. A 109, L040202] Published Thu Apr 11, 2024

from physics.hist-ph by Aur\’elien DrezetWed Apr 10 2024 10:24:31 (2 days)# 7.

arXiv:2404.06366v1 Announce Type: new Abstract: In this note, we discuss a historical point regarding Schr\”odinger’s discovery of the famous quantum wave equation in 1926 following de Broglie’s fundamental works published in 1923-1925 regarding the introduction of matter waves. Drawing on the work of historians and personal analysis, we show that de Broglie was very close to the discovery of the Schr\”odinger equation (at least for the stationary one-electron problem).

from philsciTue Apr 09 2024 18:34:23 (3 days)# 8.

]]>Oddan, Jessica (2024) Reconstructions of Quantum Theory: Methodology and the Role of Axiomatization. [Preprint]

A new indeterminacy-based quantum theory |

from physics.hist-ph by Francisco PipaFri Apr 05 2024 13:06:36 (21 hours)# 1.

arXiv:2310.04002v4 Announce Type: replace-cross Abstract: I propose a novel (interpretation of) quantum theory, which I will call Environmental Determinacy-based or EnD Quantum Theory (EnDQT). In contrast to the well-known quantum theories, EnDQT has the benefit of not adding hidden variables, and it is not in tension with relativistic causality by providing a local causal explanation of quantum correlations without measurement outcomes varying according to, for example, systems or worlds. It is conservative, and so unlike theories such as spontaneous collapse theories, no modifications of the fundamental equations of quantum theory are required to establish when determinate values arise, and in principle, arbitrary systems can be in a superposition for an arbitrary amount of time. According to EnDQT, some systems acquire determinate values at some point, and the capacity to have and give rise to determinate values through interactions propagates to other systems via local interactions. When systems are isolated from the systems that belong to these chains of interactions, they can, in principle, evolve unitarily indefinitely. EnDQT provides a series of novel empirical posits that may distinguish it from other interpretations of quantum theory. Furthermore, via its characterization of the systems that start these chains of interactions, it provides possible payoffs to other areas of physics and their foundations, such as cosmology, thermodynamics, and statistical mechanics.

from gr-qc by Sebastian Bahamonde, Daniel Blixt, Konstantinos F. Dialektopoulos, Anamaria HellFri Apr 05 2024 13:05:10 (21 hours)# 2.

arXiv:2404.02972v1 Announce Type: new Abstract: We study the degrees of freedom in New General Relativity — flat and metric compatible family of theories — around the Minkowski background in a gauge invariant manner. First, we confirm the decoupling case, in which the theory reduces to linearized gravity plus a massless KR field. We then show that, unless they vanish, the vector modes of this theory will be ghosts. In addition, we find two new branches of the theories, which are ghost-free and propagate linearly two tensor modes and in one of the cases also a massless scalar field. This shows that while the generic theory is ill-behaved, there are three possible realizations of ghost-free cases, in contradiction to the previous literature, which states that there is only one ghost-free theory in addition to general relativity.

from quant-ph by Peter Asenbaum, Chris Overstreet, Mark A. KasevichFri Apr 05 2024 13:05:04 (21 hours)# 3.

arXiv:2404.03057v1 Announce Type: new Abstract: In a uniform gravitational field, classical test objects fall universally. Any reference object or observer will fall in the same universal manner. Therefore, a uniform gravitational field cannot create dynamics between observers and classical test objects. The influence of a uniform gravitational field on matter waves and clocks, however, is described inconsistently throughout research and education. To illustrate, we discuss the behavior of a matter-wave interferometer and a clock redshift experiment in a uniform gravitational field. As a consistent formulation of the equivalence principle implies, a uniform gravitational field has no observable influence on these systems and is physically equivalent to the absence of gravity.

from gr-qc by Yang Liu, Antonio Padilla, Francisco G. PedroFri Apr 05 2024 13:05:01 (21 hours)# 4.

arXiv:2404.02961v1 Announce Type: cross Abstract: We examine the descent via membrane nucleation through a landscape of vacua where the cosmological constant is given by a combination of four-form fluxes. It has been shown that this descent can be slowed exponentially for very low curvature vacua close to Minkowski space in a wide class of models satisfying certain parametric conditions, providing a possible solution to the cosmological constant problem. We explore in detail whether or not those parametric conditions are compatible with the membrane weak gravity conjecture. Whilst it is true that there is often tension, we show that this is not always the case and present an explicit model where Minkowski space is absolutely stable and the weak gravity conjecture is satisfied. This corresponds to an extension of the Bousso-Polchinski model into a generalised DBI action for four-forms. We also clarify how the landscape should be populated in a consistent model.

from physics.hist-ph by Anne-Catherine de la Hamette, Viktoria Kabel, \v{C}aslav BruknerTue Apr 02 2024 15:06:52 (3 days)# 5.

arXiv:2404.00159v1 Announce Type: cross Abstract: We explore the notion of events at the intersection between quantum physics and gravity, inspired by recent research on superpositions of semiclassical spacetimes. By going through various experiments and thought experiments — from a decaying atom, to the double-slit experiment, to the quantum switch — we analyse which properties can and cannot be used to define events in such non-classical contexts. Our findings suggest an operational, context-dependent definition of events which emphasises that their properties can be accessed without destroying or altering observed phenomena. We discuss the implications of this understanding of events for indefinite causal order as well as the non-absoluteness of events in the Wigner’s friend thought experiment. These findings provide a first step for developing a notion of event in quantum spacetime.

from APS selected papers by Michael SchirberTue Apr 02 2024 06:00:00 (4 days)# 6.

Author(s): Michael Schirber

David Kaplan has developed a lattice model for particles that are left- or right-handed, offering a firmer foundation for the theory of weak interactions.

[Physics 17, 54] Published Tue Apr 02, 2024

from physics.hist-ph by Christian Hugo HoffmannMon Apr 01 2024 10:38:19 (4 days)# 7.

arXiv:2403.19658v1 Announce Type: new Abstract: This paper addresses the central question of what a coherent concept of probability might look like that would do justice to both classical probability theory, axiomatized by Kolmogorov, and quantum theory. At a time when quanta are receiving increased and expanded attention — think, for example, of the advances in quantum computers or the promises associated with this new technology (National Academies of Sciences: Engineering, and Medicine, 2019) — an adequate interpretation of probability, which is no less important, should be given due attention, particularly with regard to quantum theory.

from physics.hist-ph by Navinder SinghMon Apr 01 2024 10:38:18 (4 days)# 8.

arXiv:2403.19682v1 Announce Type: new Abstract: As is well known, Paul Drude put forward the very first quantitative theory of electrical conduction in metals in 1900. He could successfully account for the Wiedemann-Franz law which states that the ratio of thermal to electrical conductivity divided by temperature is a constant called the Lorenz number. As it turns out, in Drude’s derivation, there is a lucky cancellation of two errors. Drude’s under-estimate (by an order of 100) of the value of square of the average electron velocity compensated his over-estimate of the electronic heat capacity (by the same order of 100). This compensation or cancellation of two errors lead to a value of the Lorenz number very close to its experimental value. This is well known. There is another error of a factor of two which Drude made when he calculated two different relaxation times for heat conductivity and electrical conductivity. In this article we highlight how and why this error occurred in Drude’s derivation and how it was removed 5 years later (that is in 1905) by Hendrik Lorentz when he used the Boltzmann equation and a single relaxation time. This article is of pedagogical value and may be useful to undergraduate/graduate students learning solid state physics.

from philsciMon Apr 01 2024 05:39:31 (5 days)# 9.

Fay, Jonathan (2023) On the Relativity of Magnitudes: Delboeuf’s forgotten contribution to the 19th Century problem of space. [Preprint]

from philsciMon Apr 01 2024 05:31:10 (5 days)# 10.

Lewis, Peter J. (2021) Explicating quantum indeterminacy. [Preprint]

from philsciMon Apr 01 2024 05:30:51 (5 days)# 11.

]]>Lewis, Peter J. and Jhou, Nihel (2021) The Indeterminate Present. [Preprint]

Learning to Represent: Mathematics-first accounts of representation and their relation to natural language |

from philsciSun Mar 24 2024 01:37:01 (6 days)# 10.

Wallace, David (2024) Learning to Represent: Mathematics-first accounts of representation and their relation to natural language. [Preprint]

from gr-qc by Jonathan SorceFri Mar 29 2024 17:22:32 (1 day)# 1.

arXiv:2403.18937v1 Announce Type: cross Abstract: The Unruh effect can be formulated as the statement that the Minkowski vacuum in a Rindler wedge has a boost as its modular flow. In recent years, other examples of states with geometrically local modular flow have played important roles in understanding energy and entropy in quantum field theory and quantum gravity. Here I initiate a general study of the settings in which geometric modular flow can arise, showing (i) that any geometric modular flow must be a conformal symmetry of the background spacetime, and (ii) that in a well behaved class of “weakly analytic” states, geometric modular flow must be future-directed. I further argue that if a geometric transformation is conformal but not isometric, then it can only be realized as modular flow in a conformal field theory. Finally, I discuss a few settings in which converse results can be shown — i.e., settings in which a state can be constructed whose modular flow reproduces a given vector field.

from gr-qc by J. J. Relancio, L. Santamar\’ia-SanzFri Mar 29 2024 17:22:27 (1 day)# 2.

arXiv:2403.19520v1 Announce Type: cross Abstract: In this work, we present the technical details of the discussion presented in [J.J. Relancio, L.Santamar\’ia-Sanz (2024) arXiv:2403.18772], where we establish the basis of quantum theories of the free massive scalar, the massive fermionic, and the electromagnetic fields, in a doubly special relativity scenario. This construction is based on a geometrical interpretation of the kinematics of these kind of theories. In order to describe the modified actions, we find that a higher (indeed infinite) derivative field theory is needed, from which the deformed kinematics can be read. From our construction we are able to restrict the possible models of doubly special relativity to particular bases that preserve linear Lorentz invariance. We quantize the theories and also obtain a deformed version of the Maxwell equations. We analyze the electromagnetic vector potential either for an electric point-like source and a magnetic dipole. We observe that the electric and magnetic fields do not diverge at the origin for some models described with an anti de Sitter space but do for the de Sitter one in both problems.

from philsciWed Mar 27 2024 11:28:52 (3 days)# 3.

March, Eleanor (2024) Are Maxwell gravitation and Newton-Cartan theory theoretically equivalent? [Preprint]

from philsciWed Mar 27 2024 11:21:57 (3 days)# 4.

Slowik, Edward (2024) Emergent Spatial Ontologies in the Early Modern Period. In: UNSPECIFIED.

from physics.hist-ph by M. ShifmanWed Mar 27 2024 10:20:25 (3 days)# 5.

arXiv:2401.11027v2 Announce Type: replace Abstract: The first Edition of this book was released in 2000, just before the symposium “Thirty Years of Supersymmetry” was held at the William I. Fine Theoretical Physics Institute (FTPI) of the University of Minnesota. Founders and trailblazers of supersymmetry descended on FTPI, as well as a large crowd of younger theorists deeply involved in research in this area. Since then 23 years have elapsed and significant changes happened in supersymmetry (SUSY). Its history definitely needs an update. Such an update is presented below. The Second Edition of the revised collection will be released in 2024.

from physics.hist-ph by Jonte R. Hance, Sabine HossenfelderTue Mar 26 2024 09:00:19 (4 days)# 6.

arXiv:2204.01768v3 Announce Type: replace-cross Abstract: It was recently argued by Catani et al that it is possible to reproduce the phenomenology of quantum interference classically, by the double-slit experiment with a deterministic, local, and classical model (Quantum 7, 1119 (2023)). The stated aim of their argument is to falsify the claim made by Feynman (in his third book of Lectures on Physics) that quantum interference is “impossible, absolutely impossible, to explain in any classical way” and that it “contains the only mystery” of quantum mechanics. We here want to point out some problems with their argument.

from nature-physics by R. Abbasi; M. Ackermann; J. Adams; S. K. Agarwalla; J. A. Aguilar; M. Ahlers; J. M. Alameddine; N. M. Amin; K. Andeen; G. Anton; C. Argüelles; Y. Ashida; S. Athanasiadou; L. Ausborm; S. N. Axani; X. Bai; A. Balagopal V; M. Baricevic; S. W. Barwick; V. Basu; R. Bay; J. J. Beatty; J. Becker Tjus; J. Beise; C. Bellenghi; C. Benning; S. BenZvi; D. Berley; E. Bernardini; D. Z. Besson; E. Blaufuss; S. Blot; F. Bontempo; J. Y. Book; C. Boscolo Meneguolo; S. Böser; O. Botner; J. Böttcher; J. Braun; B. Brinson; J. Brostean-Kaiser; L. Brusa; R. T. Burley; R. S. Busse; D. Butterfield; M. A. Campana; K. Carloni; E. G. Carnie-Bronca; S. Chattopadhyay; N. Chau; C. Chen; Z. Chen; D. Chirkin; S. Choi; B. A. Clark; A. Coleman; G. H. Collin; A. Connolly; J. M. Conrad; P. Coppin; P. Correa; D. F. Cowen; P. Dave; C. De Clercq; J. J. DeLaunay; D. Delgado; S. Deng; K. Deoskar; A. Desai; P. Desiati; K. D. de Vries; G. de Wasseige; T. DeYoung; A. Diaz; J. C. Díaz-Vélez; M. Dittmer; A. Domi; H. Dujmovic; M. A. DuVernois; T. Ehrhardt; A. Eimer; P. Eller; E. Ellinger; S. El Mentawi; D. Elsässer; R. Engel; H. Erpenbeck; J. Evans; P. A. Evenson; K. L. Fan; K. Fang; K. Farrag; A. R. Fazely; A. Fedynitch; N. Feigl; S. Fiedlschuster; C. Finley; L. Fischer; D. Fox; A. Franckowiak; P. Fürst; J. Gallagher; E. Ganster; A. Garcia; L. Gerhardt; A. Ghadimi; C. Glaser; T. Glüsenkamp; J. G. Gonzalez; D. Grant; S. J. Gray; O. Gries; S. Griffin; S. Griswold; K. M. Groth; C. Günther; P. Gutjahr; C. Ha; C. Haack; A. Hallgren; R. Halliday; L. Halve; F. Halzen; H. Hamdaoui; M. Ha Minh; M. Handt; K. Hanson; J. Hardin; A. A. Harnisch; P. Hatch; A. Haungs; J. Häußler; K. Helbing; J. Hellrung; J. Hermannsgabner; L. Heuermann; N. Heyer; S. Hickford; A. Hidvegi; C. Hill; G. C. Hill; K. D. Hoffman; S. Hori; K. Hoshina; W. Hou; T. Huber; K. Hultqvist; M. Hünnefeld; R. Hussain; K. Hymon; S. In; A. Ishihara; M. Jacquart; O. Janik; M. Jansson; G. S. Japaridze; M. Jeong; M. Jin; B. J. P. Jones; N. Kamp; D. Kang; W. Kang; X. Kang; A. Kappes; D. Kappesser; L. Kardum; T. Karg; M. Karl; A. Karle; A. Katil; U. Katz; M. Kauer; J. L. Kelley; A. Khatee Zathul; A. Kheirandish; J. Kiryluk; S. R. Klein; A. Kochocki; R. Koirala; H. Kolanoski; T. Kontrimas; L. Köpke; C. Kopper; D. J. Koskinen; P. Koundal; M. Kovacevich; M. Kowalski; T. Kozynets; J. Krishnamoorthi; K. Kruiswijk; E. Krupczak; A. Kumar; E. Kun; N. Kurahashi; N. Lad; C. Lagunas Gualda; M. Lamoureux; M. J. Larson; S. Latseva; F. Lauber; J. P. Lazar; J. W. Lee; K. Leonard DeHolton; A. Leszczyńska; M. Lincetto; Y. Liu; M. Liubarska; E. Lohfink; C. Love; C. J. Lozano Mariscal; L. Lu; F. Lucarelli; W. Luszczak; Y. Lyu; J. Madsen; E. Magnus; K. B. M. Mahn; Y. Makino; E. Manao; S. Mancina; W. Marie Sainte; I. C. Mariş; S. Marka; Z. Marka; M. Marsee; I. Martinez-Soler; R. Maruyama; F. Mayhew; T. McElroy; F. McNally; J. V. Mead; K. Meagher; S. Mechbal; A. Medina; M. Meier; Y. Merckx; L. Merten; J. Micallef; J. Mitchell; T. Montaruli; R. W. Moore; Y. Morii; R. Morse; M. Moulai; T. Mukherjee; R. Naab; R. Nagai; M. Nakos; U. Naumann; J. Necker; A. Negi; M. Neumann; H. Niederhausen; M. U. Nisa; A. Noell; A. Novikov; S. C. Nowicki; A. Obertacke Pollmann; V. O’Dell; B. Oeyen; A. Olivas; R. Orsoe; J. Osborn; E. O’Sullivan; H. Pandya; N. Park; G. K. Parker; E. N. Paudel; L. Paul; C. Pérez de los Heros; T. Pernice; J. Peterson; S. Philippen; A. Pizzuto; M. Plum; A. Pontén; Y. Popovych; M. Prado Rodriguez; B. Pries; R. Procter-Murphy; G. T. Przybylski; C. Raab; J. Rack-Helleis; K. Rawlins; Z. Rechav; A. Rehman; P. Reichherzer; E. Resconi; S. Reusch; W. Rhode; B. Riedel; A. Rifaie; E. J. Roberts; S. Robertson; S. Rodan; G. Roellinghoff; M. Rongen; A. Rosted; C. Rott; T. Ruhe; L. Ruohan; D. Ryckbosch; I. Safa; J. Saffer; D. Salazar-Gallegos; P. Sampathkumar; S. E. Sanchez Herrera; A. Sandrock; M. Santander; S. Sarkar; S. Sarkar; J. Savelberg; P. Savina; M. Schaufel; H. Schieler; S. Schindler; L. Schlickmann; B. Schlüter; F. Schlüter; N. Schmeisser; T. Schmidt; J. Schneider; F. G. Schröder; L. Schumacher; S. Sclafani; D. Seckel; M. Seikh; S. Seunarine; R. Shah; S. Shefali; N. Shimizu; M. Silva; B. Skrzypek; B. Smithers; R. Snihur; J. Soedingrekso; A. Søgaard; D. Soldin; P. Soldin; G. Sommani; C. Spannfellner; G. M. Spiczak; C. Spiering; M. Stamatikos; T. Stanev; T. Stezelberger; T. Stürwald; T. Stuttard; G. W. Sullivan; I. Taboada; S. Ter-Antonyan; A. Terliuk; M. Thiesmeyer; W. G. Thompson; J. Thwaites; S. Tilav; K. Tollefson; C. Tönnis; S. Toscano; D. Tosi; A. Trettin; C. F. Tung; R. Turcotte; J. P. Twagirayezu; M. A. Unland Elorrieta; A. K. Upadhyay; K. Upshaw; A. Vaidyanathan; N. Valtonen-Mattila; J. Vandenbroucke; N. van Eijndhoven; D. Vannerom; J. van Santen; J. Vara; J. Veitch-Michaelis; M. Venugopal; M. Vereecken; S. Verpoest; D. Veske; A. Vijai; C. Walck; Y. Wang; C. Weaver; P. Weigel; A. Weindl; J. Weldert; A. Y. Wen; C. Wendt; J. Werthebach; M. Weyrauch; N. Whitehorn; C. H. Wiebusch; D. R. Williams; L. Witthaus; A. Wolf; M. Wolf; G. Wrede; X. W. Xu; J. P. Yanez; E. Yildizci; S. Yoshida; R. Young; S. Yu; T. Yuan; Z. Zhang; P. Zhelnin; P. Zilberman; M. ZimmermanMon Mar 25 2024 20:00:00 (4 days)# 7.

Nature Physics, Published online: 26 March 2024; doi:10.1038/s41567-024-02436-wInteractions of atmospheric neutrinos with quantum-gravity-induced fluctuations of the metric of spacetime would lead to decoherence. The IceCube Collaboration constrains such interactions with atmospheric neutrinos.

from PRA – fundamentalconcepts by Gabriel H. S. Aguiar and George E. A. MatsasMon Mar 25 2024 06:00:00 (5 days)# 8.

Author(s): Gabriel H. S. Aguiar and George E. A. Matsas

Explaining the behavior of macroscopic objects from the point of view of the quantum paradigm has challenged the scientific community for the past century. A mechanism of gravitational self-interaction, governed by the so-called Schrödinger-Newton equation, is among the proposals that aim to shed so…

[Phys. Rev. A 109, 032223] Published Mon Mar 25, 2024

from philsciSun Mar 24 2024 01:38:19 (6 days)# 9.

]]>Riedel, Timotheus (2023) Relational Quantum Mechanics, quantum relativism, and the iteration of relativity. [Preprint]

In quantum mechanics, the zitterbewegung is a rapid oscillatory movement of quantum particle in single plane. It is a motion which can give idea about the sub structure of quantum particles. It is believed to be the reason for magnetic moment of the quantum particle. In 2023, a new toroidal model of proton has been proposed by Kovacs et al. In this article, a modification of the model has been proposed with the concept of ontic wave function and using the phenomenon of nuclear magnetic resonance. The analysis of zitterbewegung and the ontic wave function has shown that, using zitterbewegung and the concept of Larmor precession, a model for generation of radiant energy during nuclear magnetic resonance can be derived.

]]>In this paper I inquire into the applicability of topological structures in the mathematical modeling of certain quantum situations and attempt an interpretation, on the level of metatheory, of phenomena associated with the time evolution of quantum processes and the individuality of quantum objects upon observation. Accordingly the paper engages, on the one hand, in an epistemologically oriented discussion of the merits of topological approaches concerning natural science in general and certain questions of quantum theory in particular, and on the other, in an elaboration of a proper topological structure to deal with the mathematical aspects of an open question of the theory of quantum histories, the latter as developed mainly by C. J. Isham and co. On this motivation a brief discussion concerning the topological nature of the Bohm-Aharonov effect is thought to be in order. Overall the primary focus is to discuss the relevance of topology, as a pure mathematical theory of structures, with the quantum context and in particular of the quantum histories processes over temporal points and continuous time intervals.

]]>In this paper, we analyze the thought experiment of “Wigner’s friend” and point out that new understanding should be made to Born’s rule and measurement process: Born’s rule is no longer seen as a rule based on the history of the quantum system’s, and the measurement results are no longer directly related to the state of the measured object before the measurement. Inspired by Everett III and H. Zurek’s views, we believe that Born’s rule reflects the coordination between states of different parts in quantum entanglement systems, so it has nothing to do with the history of particles themselves but rather with the historical records. A new formulation of pilot wave theory, objective relative state formulation, or ORSF is suggested. Under this interpretation, micro-particles can also be assigned definite states before being observed. Based on this formulation, Wigner’s friend-like scenarios can be effectively explained. We also notice that our universe can be totally retrocausal by the new formulation. The new interpretation brings new perspectives to many quantum phenomena.

]]>The Negative Energy Sea from philsciSun Mar 17 2024 20:41:15 (5 days)# 12. Saunders, Simon (1991) The Negative Energy Sea. Philosophy of Vacuum. pp. 65-109. ISSN 9780198244493 Many worlds or one: reply to Steeger |

from philsciSat Mar 23 2024 03:01:45 (7 hours)# 1.

March, Eleanor (2024) Many worlds or one: reply to Steeger. [Preprint]

from physics.hist-ph by Alessio Rocci, Thomas Van RietFri Mar 22 2024 11:49:22 (23 hours)# 2.

arXiv:2403.14008v1 Announce Type: new Abstract: This paper analyzes the effective field theory perspective on modern physics through the lens of the quantum theory of gravitational interaction. The historical part argues that the search for a theory of quantum gravity stimulated the change in outlook that characterizes the modern approach to the Standard Model of particle physics and General Relativity. We present some landmarks covering a long period, i.e., from the beginning of the 1930s until 1994, when, according to Steven Weinberg, the modern bottom-up approach to General Relativity began. Starting from the first attempt to apply the quantum field theory techniques to perturbatively quantize Einstein’s theory, we explore its developments and interaction with the top-down approach encoded by String Theory. In the last part of the paper, we focus on this last approach to describe the relationship between our modern understanding of String Theory and Effective Field Theory in today’s panorama. To this end, the non-historical part briefly explains the modern concepts of moduli stabilization and Swampland to understand another change in focus that explains the present framework where some string theorists move.

from gr-qc by Bikash R. Dinda, Narayan BanerjeeFri Mar 22 2024 11:49:07 (23 hours)# 3.

arXiv:2403.14223v1 Announce Type: cross Abstract: We study the evolution of the dark energy equation of the state parameter without tying ourselves to any specific cosmological model or parametrization except spatial homogeneity, isotropy, and flatness leading to a flat Friedmann-Lema\^itre-Robertson-Walker (FLRW) metric. Instead, we rely on actual observational data to guide our analysis. This is the first study in which we combine the cosmological background and the growth observations to reconstruct the equation of the state parameter of dark energy independent of the present values of the matter-energy density parameter and Hubble parameter. We use information about the Hubble parameter from cosmic chronometer data and the growth rate from observations related to growth rates. Our method involves a posterior approach of Gaussian process regression analysis to figure out the Hubble parameter and growth rate, plus their changes with redshift. The significant shift of paradigm in this study lies in the independence of the reconstruction of the dark energy equation of state from any prior knowledge of the present Hubble parameter and matter energy density parameter. We find a slight hint of dynamical behavior in dark energy. However, the evidence is not significant. We also find a leaning towards non-phantom behavior over phantom behavior. Intriguingly, we observe that the $\Lambda$CDM model nearly touches the lower boundary of the 1$\sigma$ confidence region for the reconstructed dark energy equation of state parameter in the redshift range $0.6 \lesssim z \lesssim 0.85$. However, it comfortably resides within the 1$\sigma$ confidence region in the redshift range under investigation, $0\leq z \leq 1.5$. Consequently, the non-parametric, model-independent reconstruction of dark energy provides no compelling evidence to deviate from the $\Lambda$CDM model when considering cosmic chronometer and growth rate observations.

from APS selected papers by Mark BuchananFri Mar 22 2024 06:00:00 (1 day)# 4.

Author(s): Mark Buchanan

A new gravimeter is compact and stable and can detect the daily solar and lunar gravitational oscillations that are responsible for the tides.

[Physics 17, 48] Published Fri Mar 22, 2024

from PRL by Anirban Das, Noah Kurinsky, and Rebecca K. LeaneFri Mar 22 2024 06:00:00 (1 day)# 5.

Author(s): Anirban Das, Noah Kurinsky, and Rebecca K. Leane

Sub-GeV dark matter particles can be probed via power measurements in quantum devices.

[Phys. Rev. Lett. 132, 121801] Published Fri Mar 22, 2024

from PRA – fundamentalconcepts by Tae-Hun Lee and Jarosław K. KorbiczFri Mar 22 2024 06:00:00 (1 day)# 6.

Author(s): Tae-Hun Lee and Jarosław K. Korbicz

We address the problem of the fundamental limitations of information extraction from the environment in open quantum systems. We derive a model-independent, hybrid quantum-classical solution of open dynamics in the recoilless limit, which includes environmental degrees of freedom. Specifying to the …

[Phys. Rev. A 109, 032221] Published Fri Mar 22, 2024

from physics.hist-ph by Peter WestThu Mar 21 2024 10:50:08 (2 days)# 7.

arXiv:2403.13453v1 Announce Type: new Abstract: I give an account of what it was like to be a PhD student of Abdus Salam and also to take part during the early stages of the development of supersymmetry.

from physics.hist-ph by Henrique GomesTue Mar 19 2024 10:12:44 (4 days)# 8.

arXiv:2403.10970v1 Announce Type: new Abstract: The hole argument of general relativity threatens a radical and pernicious form of indeterminism. One natural response to the argument is that points belonging to different but isometric models should always be identified, or ‘dragged-along’, by the diffeomorphism that relates them. In this paper, I first criticise this response and its construal of isometry: it stumbles on certain cases, like Noether’s second theorem. Then I go on to describe how the essential features of Einstein\rq{}s `point-coincidence’ response to the hole argument avoid the criticisms of the `drag-along response’ and are compatible with Noether’s second theorem.

from physics.hist-ph by Pascal Marquet, Max PlanckMon Mar 18 2024 09:44:45 (5 days)# 9.

arXiv:2403.09686v1 Announce Type: new Abstract: This is an English (annotated) translation of the Thesis report (in German) of Max Planck at the University of Munich (1879)

from physics.hist-ph by Pascal Marquet, Max PlanckMon Mar 18 2024 09:44:43 (5 days)# 10.

arXiv:2403.09688v1 Announce Type: new Abstract: This is an English (annotated) translation of the German paper by Max Planck (1887) about “The principle of the conservation of energy”

from physics.hist-ph by Pascal Marquet, Max PlanckMon Mar 18 2024 09:44:42 (5 days)# 11.

]]>arXiv:2403.09689v1 Announce Type: new Abstract: This is an English (annotated) translation of the German paper by Max Planck (1943) about “The history of the discovery of the physical quantum of action”

Bridgman and the Normative Independence of Science: An Individual Physicist in the Shadow of the Bomb |

from philsciSat Mar 16 2024 03:22:15 (1 day)# 1.

Jalloh, Mahmoud (2024) Bridgman and the Normative Independence of Science: An Individual Physicist in the Shadow of the Bomb. [Preprint]

from philsciSat Mar 16 2024 03:21:31 (1 day)# 2.

Linnemann, Niels and Michels, Robert (2024) Laws of nature as results of a trade-off — Rethinking the Humean trade-off conception. [Preprint]

from philsciSat Mar 16 2024 03:20:41 (1 day)# 3.

Scano, Pier Sandro (2024) The fifth Solvay Congress really over or still open Between Physics and Philosophy. [Preprint]

from quant-ph by Masud MansuripurFri Mar 15 2024 08:37:20 (2 days)# 4.

arXiv:2403.08842v1 Announce Type: new Abstract: In learning quantum mechanics, an essential question has always been: How does one go about developing a “physical feel” for quantum phenomena? Naturally, one needs a basis or ground zero to start from, and that basis must be unlike anything with which we are already familiar in consequence of our experiences with the world of classical physics. We argue (channeling Richard Feynman) that the most elementary and the least cumbersome concept to build upon is the existence of complex probability amplitudes for physical events. An event that can take place in multiple alternative ways should be treated by adding the corresponding amplitudes when the paths are, in principle, indistinguishable, and by adding the probabilities themselves when the paths are distinguishable. Once we accept this principle and hone our intuition by examining quantum phenomena in its light, we will be on the path to “understanding” quantum mechanics. Elementary examples from the field of quantum optics demonstrate how adherence to Feynman’s principle could lead to a better, more “intuitive” appreciation for the magic of quantum mechanics.

from quant-ph by Martijn Janse, Dennis G. Uitenbroek, Loek van Everdingen, Jaimy Plugge, Bas Hensen, Tjerk H. OosterkampFri Mar 15 2024 08:37:17 (2 days)# 5.

arXiv:2403.08912v1 Announce Type: new Abstract: A consistent theory describing the dynamics of quantum systems interacting on a classical space-time was recently put forward by Oppenheim et al..[1, 2]. Quantum states may retain their coherence, at the cost of some amount of stochasticity of the spacetime metric, characterized by a spacetime diffusion parameter. Here, we report existing experimental upper bounds on such space-time diffusion, based on a review of several types of experiments with very low force noise over a broad range of test masses from single atoms to several kilograms. We find an upper bound at least 15 orders of magnitude lower as compared to the initial bounds for explicit models presented by Oppenheimn et al. The results presented here provide a path forward for future experiments that can help evaluate classical-quantum theories

from gr-qc by Etera R. LivineFri Mar 15 2024 08:37:13 (2 days)# 6.

arXiv:2403.09364v1 Announce Type: new Abstract: In the quest of a physical theory of quantum gravity, spin foam models, or in short spinfoams, propose a well-defined path integral summing over quantized discrete space-time geometries. At the crossroad of topological quantum field theory, dynamical triangulations, Regge calculus, and loop quantum gravity, this framework provides a non-perturbative and background independent quantization of general relativity. It defines transition amplitudes between quantum states of geometry, and gives a precise picture of the Planck scale geometry with quantized areas and volumes. Gravity in three space-time dimensions is exactly quantized in terms of the Ponzano-Regge state-sum and Turaev-Viro topological invariants. In four space-time dimensions, gravity is formulated as a topological theory, of the BF type, with extra constraints, and hence quantized as a topological state-sum filled with defects. This leads to the Engle-Pereira-Rovelli-Livine (EPRL) spinfoam model, that can be used for explicit quantum gravity computations, for example for resolving the Big Bang singularity by a bounce or in black-to-white hole transition probability amplitudes.

from quant-ph by Inge S. HellandFri Mar 15 2024 08:37:02 (2 days)# 7.

arXiv:2403.09224v1 Announce Type: new Abstract: A general theory based upon 6 postulates is introduced. The basical notions are theoretical variables that are associated with an observer or with a group of communicating observers. These variables may be accessible or inaccessible. From these postulates, the ordinary formalism of quantum theory are derived. The mathematical derivations are not given in this article, but I refer to the recent articles [9, 10]. Three possible applications of the general theory can be given; 1) The variables may decision variables connected to the decisions of a person or of a group of persons. 2) The variables may be statistical parameters or future data, But most importantly here: 3) The variables are physical variables in some context. This last application gives a completely new foundation of quantum mechanics, a foundation which in my opinion is much more easy to understand than the ordinary formalism.The other applications seem also to give interesting consequences of the approach. Socalled paradoxes like that of Schr\”odinger’s cat can be clarified under the theory. Explanations of the outcomes of David Bohm’s version of the EPR experiment and of the Bell experiment are provided. Finally, references to links towards relativity theory and to quantum field theory are given.

from philsciThu Mar 14 2024 17:58:12 (2 days)# 8.

Dulani, Saakshi (2024) Black Hole Paradoxes: A Unified Framework for Information Loss. [Preprint]

from philsciThu Mar 14 2024 17:56:02 (2 days)# 9.

Linnemann, Niels and Smeenk, Chris and Baker, Mark Robert (2023) GR as a classical spin-2 theory? Philosophy of Science. ISSN 1539-767X

from physics.hist-ph by Huw Price, Ken WhartonThu Mar 14 2024 11:21:11 (3 days)# 10.

arXiv:2309.10969v3 Announce Type: replace-cross Abstract: We show that Bell correlations may arise as a special sort of selection artefact, produced by ordinary control of the initial state of the experiments concerned. This accounts for nonlocality, without recourse to any direct spacelike causality or influence. The argument improves an earlier proposal in (arXiv:2101.05370v4 [quant-ph], arXiv:2212.06986 [quant-ph]) in two main respects: (i) in demonstrating its application in a real Bell experiment; and (ii) in avoiding the need for a postulate of retrocausality. This version includes an Appendix, discussing the relation of the proposal to the conclusions of Wood and Spekkens (arXiv:1208.4119 [quant-ph]).

from philsciTue Mar 12 2024 16:24:59 (5 days)# 11.

DiBella, Nicholas (2024) Cantor, Choice, and Paradox. [Preprint]

from physics.hist-ph by Frank WilczekTue Mar 12 2024 12:40:28 (5 days)# 12.

arXiv:2403.06038v1 Announce Type: cross Abstract: The bulk of this paper centers around the tension between confinement and freedom in QCD. I discuss how it can be understood heuristically as a manifestation of self-adhesive glue and how it fits within the larger contexts of energy-time uncertainty and $\textit{real virtuality}$. I discuss the possible emergence of $\textit{treeons}$ as a tangible ingredient of (at least) pure gluon $SU(3)$. I propose $\textit{flux channeling}$ as a method to address that and allied questions about triality flux numerically, and indicate how to implement it for electric and magnetic flux in material systems. That bulk is framed with broad-stroke, necessarily selective sketches of the past and possible future of strong interaction physics. At the end, I’ve added an expression of gratitude for my formative experience at the Erice school, in 1973.

from philsciTue Mar 12 2024 03:50:52 (5 days)# 13.

van Leeuwen, Robert (2023) From S-matrix theory to strings: Scattering data and the commitment to non-arbitrariness. [Preprint]

from philsciTue Mar 12 2024 03:49:15 (5 days)# 14.

Oldofredi, Andrea (2024) Unexpected Quantum Indeterminacy. [Preprint]

from philsciMon Mar 11 2024 16:05:26 (6 days)# 15.

Srinivasan, Radhakrishnan (2024) Do arbitrary constants exist? A logical objection. [Preprint]

from APS selected papers by Ulrich D. JentschuraMon Mar 11 2024 06:00:00 (6 days)# 16.

Author(s): Ulrich D. Jentschura

Researchers have measured the transition energy of several highly excited states, which could help resolve a discrepancy about the size of the proton.

[Physics 17, 39] Published Mon Mar 11, 2024

from philsciSun Mar 10 2024 01:56:35 (1 week)# 17.

Khudairi (Bowen), Hasen (Tim) (2014) Physical Necessitism. [Preprint]

from philsciSun Mar 10 2024 01:55:12 (1 week)# 18.

Wolf, William J. and Duerr, Patrick M. (2024) Promising Stabs in the Dark: Theory Virtues and Pursuit-Worthiness in the Dark Energy Problem. [Preprint]

from philsciSun Mar 10 2024 01:52:45 (1 week)# 19.

Halpin, John F. (2024) Hard Problems, Interpretive Concepts, and Humean Laws. [Preprint]

from philsciSun Mar 10 2024 01:51:03 (1 week)# 20.

De Bianchi, Silvia (2024) Not Even Ideal. Kant on Absolute Time and Gödel’s Rotating Universes. [Preprint]

from philsciSun Mar 10 2024 01:49:47 (1 week)# 21.

]]>Calderón, Francisco (2024) The Causal Axioms of Algebraic Quantum Field Theory: A Diagnostic. In: UNSPECIFIED.

Determining the difference between local acceleration and local gravity: applications of the equivalence principle to relativistic trajectories |

from gr-qc by Steven A. BalbusFri Mar 08 2024 12:30:03 (22 hours)# 1.

arXiv:2403.03965v1 Announce Type: new Abstract: We show by direct calculation that the common Equivalence Principle explanation for why gravity must deflect light is quantitatively incorrect by a factor of three in Schwarzschild geometry. It is therefore possible, at least as a matter of principle, to tell the difference between local acceleration and a true gravitational field by measuring the local deflection of light. We calculate as well the deflection of test particles of arbitrary energy, and construct a leading-order coordinate transformation from Schwarzschild to local inertial coordinates, which shows explicitly how the effects of spatial curvature manifest locally for relativistic trajectories of both finite and vanishing rest mass particles.

from physics.hist-ph by Timotheus RiedelFri Mar 08 2024 12:30:03 (22 hours)# 2.

arXiv:2403.04069v1 Announce Type: new Abstract: The idea that the dynamical properties of quantum systems are invariably relative to other systems has recently regained currency. Using Relational Quantum Mechanics (RQM) for a case study, this paper calls attention to a question that has been underappreciated in the debate about quantum relativism: the question of whether relativity iterates. Are there absolute facts about the properties one system possesses relative to a specified reference, or is this again a relative matter, and so on? It is argued that RQM (in its best-known form) is committed to what I call the Unrestricted Iteration Principle (UIP), and thus to an infinite regress of relativisations. This principle plays a crucial role in ensuring the communicability and coherence of interaction outcomes across observers. It is, however, shown to be incompatible with the widespread, conservative reading of RQM in terms of relations, instead necessitating the adoption of the more unorthodox notion of perspectival facts. I conclude with some reflections on the current state of play in perspectivist versions of RQM and quantum relativism more generally, underscoring both the need for further conceptual development and the importance of the iteration principle for an accurate cost-benefit analysis of such interpretations.

from physics.hist-ph by William J. Wolf, Patrick M. DuerrFri Mar 08 2024 12:30:02 (22 hours)# 3.

arXiv:2403.04364v1 Announce Type: new Abstract: The paper argues that we ought to conceive of the Dark Energy problem — the question of how to account for observational data, naturally interpreted as accelerated expansion of the universe — as a crisis of underdetermined pursuit-worthiness. Not only are the various approaches to the Dark Energy problem evidentially underdetermined; at present, no compelling reasons single out any of them as more likely to be true than the other. More vexingly for working scientists, none of the approaches stands out as uncontroversially preferable over its rivals in terms of its rationally warranted promise, i.e. the reasons to further work on, explore and develop it. We demonstrate this claim by applying a Peircean economic model of pursuit-worthiness in terms of a cognitive cost/benefit estimate — with the instantiation of theory virtues as key indicators of cognitive gains — to the four main Dark Energy proposals (the cosmological constant approach, modified gravity, quintessence, and inhomogeneous cosmologies). Our analysis yields that these approaches do not admit of an unambiguous, or uncontroversial, ranking with respect to which ansatz deserves distinguished attention and research efforts. The overall methodological counsel that our analysis underwrites recommends a pragmatic double research strategy forward: to encourage and foster theory pluralism and the search for tests — with the goal of enhancing the testability of the $\Lambda$CDM model and “testing it to destruction”.

from gr-qc by Ichiro OdaFri Mar 08 2024 12:29:54 (22 hours)# 4.

arXiv:2403.04056v1 Announce Type: cross Abstract: We study the problem of how to derive conformal symmetry in the framework of quantum gravity. We start with a generic gravitational theory which is invariant under both the general coordinate transformation (GCT) and Weyl transformation (or equivalently, local scale transformation), and then construct its BRST formalism by fixing the gauge symmetries by the extended de Donder gauge and scalar gauge conditions. These gauge-fixing conditions are invariant under global $GL(4)$ and global scale transformations. The gauge-fixed and BRST invariant quantum action possesses a huge Poincar\’e-like $IOSp(10|10)$ global symmetry, from which we can construct an extended conformal symmetry in a flat Minkowski background in the sense that the Lorentz symmetry is replaced with the $GL(4)$ symmetry. Moreover, we construct the conventional conformal symmetry out of this extended symmetry. With a flat Minkowski background $\langle g_{\mu\nu} \rangle = \eta_{\mu\nu}$ and a non-zero scalar field $\langle \phi \rangle \neq 0$, the $GL(4)$ and global scale symmetries are spontaneously broken to the Lorentz symmetry, thereby proving that the graviton and the dilaton are respectively the corresponding Nambu-Goldstone bosons, and therefore they must be exactly massless at nonperturbative level. One of remarkable aspects in our findings is that in quantum gravity, a derivation of conformal symmetry does not depend on a classical action, and its generators are built from only the gauge-fixing and the FP ghost actions. Finally, we address a generalized Zumino theorem in quantum gravity.

from PRA – fundamentalconcepts by Michael Suleymanov, Ismael L. Paiva, and Eliahu CohenThu Mar 07 2024 05:00:00 (2 days)# 5.

Author(s): Michael Suleymanov, Ismael L. Paiva, and Eliahu Cohen

Quantum reference frames have attracted renewed interest recently, as their exploration is relevant and instructive in many areas of quantum theory. Among the different types, position and time reference frames have captivated special attention. Here, we introduce and analyze a nonrelativistic frame…

[Phys. Rev. A 109, 032205] Published Thu Mar 07, 2024

from philsciThu Mar 07 2024 03:11:00 (2 days)# 6.

Linnemann, Niels and Read, James and Teh, Nicholas (2024) The local validity of special relativity from a scale-relative perspective. [Preprint]

from physics.hist-ph by Francisco Calder\’onWed Mar 06 2024 10:37:27 (2 days)# 7.

arXiv:2401.06504v2 Announce Type: replace-cross Abstract: Algebraic quantum field theory (AQFT) puts forward three “causal axioms” that aim to characterize the theory as one that implements relativistic causation: the spectrum condition, microcausality, and primitive causality. In this paper, I aim to show, in a minimally technical way, that none of them fully explains the notion of causation appropriate for AQFT because they only capture some of the desiderata for relativistic causation I state or because it is often unclear how each axiom implements its respective desideratum. After this diagnostic, I will show that a fourth condition, local primitive causality (LPC), fully characterizes relativistic causation in the sense of fulfilling all the relevant desiderata. However, it only encompasses the virtues of the other axioms because it is implied by them, as I will show from a construction by Haag and Schroer (1962). Since the conjunction of the three causal axioms implies LPC and other important results in QFT that LPC does not imply, and since LPC helps clarify some of the shortcomings of the three axioms, I advocate for a holistic interpretation of how the axioms characterize the causal structure of AQFT against the strategy in the literature to rivalize the axioms and privilege one among them.

from physics.hist-ph by Andrea Di Biagio, Carlo RovelliTue Mar 05 2024 16:54:39 (3 days)# 8.

arXiv:2403.01062v1 Announce Type: new Abstract: An influential theorem by Satosi Wantabe convinced many that there can be no genuinely probabilistic theory with both non-trivial forward and backward transition probabilities. We show that this conclusion does not follow from the theorem. We point out the flaw in the argument, and we showcase examples of theories with well-defined backward and forward transition probabilities.

from physics.hist-ph by Juliano C. S. NevesTue Mar 05 2024 16:54:38 (3 days)# 9.

arXiv:2204.08413v2 Announce Type: replace Abstract: The theory of regularity is a philosophical perspective in which laws of nature are just descriptions, that is to say, laws of nature do not govern the world. Moreover, according to the theory of regularity, the number of laws of nature might be infinite, thus any attempt towards the theory of everything is doomed. Here I propose a special or restricted theory of regularity. The main difference as to the well-known version of that theory is both the range of validity and the scale of the laws of nature. Laws of nature ought to be considered just inside the observable universe and within certain energy and length scales. Even so I apply the theory of regularity to the multiverse scenario. As a consequence, the special theory of regularity supports only two types of multiverses by comparison with our world: those ones with a different sequence of unique events and different laws of nature and those ones with the same sequence of unique events and the same laws of nature instanced by the unique events. The latter case is some sort of eternal recurrence or a parallel eternal recurrence.

from philsciSat Mar 02 2024 21:50:08 (6 days)# 10.

]]>Maggiani, Marco (2024) The Unruh Effect and Theory Interpretation in an Effective Framework. [Preprint]

Your Cosmos Needs You! From Nothingness to Quantum Existentialism |

from philsciSat Mar 02 2024 01:56:48 (18 hours)# 1.

Rickles, Dean (2023) Your Cosmos Needs You! From Nothingness to Quantum Existentialism. [Preprint]

from philsciSat Mar 02 2024 01:55:08 (18 hours)# 2.

Maggiani, Marco (2024) The Unruh Effect and Theory Intepretation in an Effective Framework. [Preprint]

from physics.hist-ph by Shahen HacyanFri Mar 01 2024 14:40:52 (1 day)# 3.

arXiv:2402.19400v1 Announce Type: new Abstract: In the 17th and 18th centuries, several natural philosophers studied the phenomenon of refraction and attempted to obtain the Snell law from various assumptions. Lacking experimental data, it was generally believed that light travels faster in a refracting medium than in air. In the present article, I review the contributions to the problem of light refraction by Descartes, Fermat, Huygens, Leibniz, Newton, Clairaut, and finally Maupertuis who established a principle of least action based on his own approach to the problem.

from physics.hist-ph by Hubert KalfFri Mar 01 2024 14:40:51 (1 day)# 4.

arXiv:2402.19104v1 Announce Type: cross Abstract: The hitherto unknown author of a citation by Goethe in his History of Colours is identified as J. E. Montucla and the context of Montucla’s quotation is discussed.

from APS selected papers by Philip BallFri Mar 01 2024 05:00:00 (1 day)# 5.

Author(s): Philip Ball

Experiments demonstrate some of the unusual features of molecular reactions that occur in the deep cold of interstellar space.

[Physics 17, 37] Published Fri Mar 01, 2024

from philsciFri Mar 01 2024 03:50:37 (1 day)# 6.

Peebles, P. James E. (2024) The physicists philosophy of physics. [Preprint]

from philsciFri Mar 01 2024 03:46:30 (1 day)# 7.

Barandes, Jacob A. (2024) New Prospects for a Causally Local Formulation of Quantum Theory. [Preprint]

from philsciFri Mar 01 2024 03:44:35 (1 day)# 8.

Menon, Tushar (2024) The inferentialist guide to quantum mechanics. [Preprint]

from physics.hist-ph by Marian KupczynskiThu Feb 29 2024 10:42:10 (2 days)# 9.

arXiv:2402.00725v2 Announce Type: replace-cross Abstract: In his article in Science, Nicolas Gisin claimed that quantum correlations emerge from outside space time. We explain that they are due to space time symmetries. This paper is a critical review of metaphysical conclusions found in many recent articles. It advocates the importance of contextuality, Einstein causality and global symmetries. Bell tests allow only rejecting probabilistic coupling provided by a local hidden variable model, but they do not justify metaphysical speculations about quantum nonlocality and objects which know about each other state, even when separated by large distances. The violation of Bell inequalities in physics and in cognitive science can be explained using the notion of Bohr contextuality. If contextual variables, describing varying experimental contexts, are correctly incorporated into a probabilistic model, then the Bell and CHSH inequalities cannot be proven and nonlocal correlations may be explained in an intuitive way. We also elucidate the meaning of statistical independence assumption incorrectly called free choice, measurement independence or no conspiracy. Since correlation does not imply causation, the violation of statistical independence should be called contextuality and it does not restrict the experimenter freedom of choice. Therefore, contrary to what is believed, closing the freedom of choice loophole does not close the contextuality loophole.

from philsciThu Feb 29 2024 02:52:09 (2 days)# 10.

Murgueitio Ramírez, Sebastián and Hall, Geoffrey (2024) Symmetries and Representation. [Preprint]

from physics.hist-ph by Per \”OstbornWed Feb 28 2024 12:22:58 (3 days)# 11.

arXiv:2402.17066v1 Announce Type: cross Abstract: Born’s rule is the recipe for calculating probabilities from quantum mechanical amplitudes. There is no generally accepted derivation of Born’s rule from first principles. In this paper, it is motivated from assumptions that link the ontological content of a proper physical model to the epistemic conditions of the experimental context. More precisely, it is assumed that all knowable distinctions should correspond to distinctions in a proper model. This principle of “ontological completeness” means, for example, that the probabilistic treatment of the double slit experiment with and without path information should differ. Further, it is assumed that the model should rely only on knowable ontological elements, and that failure to fulfill this principle of “ontological minimalism” gives rise to wrong predictions. Consequently, probabilities should be assigned only to observable experimental outcomes. Also, the method to calculate such probabilities should not rely on the existence of a precise path of the observed object if this path is not knowable. A similar principle was promoted by Born, even though he did not apply it to probability. Another crucial assumption is that the proper rule to calculate probabilities should be generally valid. It should be applicable in all experimental contexts, regardless the setup that determines which attributes of the studied object are observed, together with the probability to observe each of the associated attribute values. There is no need to refer to the Hilbert space structure of quantum mechanics in the present treatment. Rather, some elements of this structure emerge from the analysis.

from physics.hist-ph by Axel MaasWed Feb 28 2024 12:22:57 (3 days)# 12.

arXiv:2305.01960v2 Announce Type: replace-cross Abstract: There is an odd tension in electroweak physics. Perturbation theory is extremely successful. At the same time, fundamental field theory gives manifold reasons why this should not be the case. This tension is resolved by the Fr\”ohlich-Morchio-Strocchi mechanism. However, the legacy of this work goes far beyond the resolution of this tension, and may usher in a fundamentally and ontologically different perspective on elementary particles, and even quantum gravity.

from physics.hist-ph by Claus KieferTue Feb 27 2024 17:22:56 (4 days)# 13.

]]>arXiv:2305.07331v2 Announce Type: replace-cross Abstract: I investigate the question whether G\”odel’s undecidability theorems play a crucial role in the search for a unified theory of physics. I conclude that unless the structure of space-time is fundamentally discrete we can never decide whether a given theory is the final one or not. This is relevant for both canonical quantum gravity and string theory.