Weekly Papers on Quantum Foundations (4)

On gravitational effects of light. (arXiv:2301.08132v1 [physics.hist-ph]) 

from 

physics.hist-ph updates on arXiv.org

 by 

Alessio Rocci

Fri Jan 20 2023 10:09:23 (23 hours)

# 1.

Translation and Commentary of L\’eon Rosenfeld’s \”Uber die Gravitationwirkungen des Lichtes, Zeitschrift f\”ur Physik 65: 589-599 (1930). Originally published in German. Submitted for publication on September 26, 1930. (See [1] in the Comments with References section before reading this English translation). The gravitational field generated by an electromagnetic field is calculated using of laws of quantum mechanics and it is shown that the gravitational energy created turns out to be infinitely large, highlighting a new difficulty for the Heisenberg-Pauli quantum theory of wave fields. In addition, the transition processes, in which light and gravitational quanta are involved, that can take place in first approximation are briefly discussed.

  Send To > Keep unreadDelete

Reassessing the problem of time of quantum gravity. (arXiv:2301.07973v1 [gr-qc]) 

from 

gr-qc updates on arXiv.org

 by 

Alvaro Mozota Frauca

Fri Jan 20 2023 10:09:21 (23 hours)

# 2.

In this paper I raise a worry about the most extended resolutions of the problem of time of canonical quantizations of general relativity. The reason for this is that these resolutions are based on analogies with deparametrizable models for which the problem can be solved, while I argue in this paper that there are good reasons for doubting about these resolutions when the theory is not deparametrizable, which is the case of general relativity. I introduce an example of a non-deparametrizable model, a double harmonic oscillator system expressed by its Jacobi action, and argue that the problem of time for this model is not solvable, in the sense that its canonical quantization doesn’t lead to the quantum theory of two harmonic oscillators and the standard resolutions of the problem of time don’t work for this case. I argue that as general relativity is strongly analogous to this model, one should take seriously the view that the canonical quantization of general relativity doesn’t lead to a meaningful quantum theory. Finally, I comment that this has an impact on the foundations of different approaches to quantum gravity.

  Send To > Keep unreadDelete

A new perspective on Doubly Special Relativity. (arXiv:2301.08070v1 [gr-qc]) 

from 

gr-qc updates on arXiv.org

 by 

J. M. Carmona, J. L. Cortés, J. J. Relancio, M. A. Reyes

Fri Jan 20 2023 10:09:16 (23 hours)

# 3.

Doubly special relativity considers a deformation of the special relativistic kinematics parametrized by a high-energy scale, in such a way that it preserves a relativity principle. When this deformation is assumed to be applied to any interaction between particles one faces some inconsistencies. In order to avoid them, we propose a new perspective where the deformation affects only the interactions between elementary particles. A consequence of this proposal is that the deformation cannot modify the special relativistic energy-momentum relation of a particle.

  Send To > Keep unreadDelete

Is “Quantum principle of relativity” complete?. (arXiv:2301.07802v1 [quant-ph]) 

from 

quant-ph updates on arXiv.org

 by 

Ryszard Horodecki

Fri Jan 20 2023 10:09:14 (23 hours)

# 4.

Dragan and Ekert in the paper New. J. Phys. \textbf{22} 033038 (2021) presented “quantum principle of relativity” (QPR) based on Galileo’s principle of relativity, which involves both superluminal $G_S$ and subluminal $G_s$ families of observers and argue that then they are considered on the same footing it “implies the emergence of non-deterministic dynamics, together with complex probability amplitudes and multiple trajectories.”. Here I discuss QPR in the context of Heisenberg’s classification of the fundamental physical theoretical models under the role universal constants of nature: Planck’s constant $\hslash$ and speed of light $c$. In particular I point out that the above conclusion is overestimated as both the superluminal and subluminal branches are separable in the sense that there is no mathematical coherent formalism that connect both branches of $G_S$ and $G_s$ together.

  Send To > Keep unreadDelete

Putting the ‘Experiment’ back into the ‘Thought Experiment’ 

from 

PhilSci-Archive: No conditions. Results ordered -Date Deposited.

Fri Jan 20 2023 07:21:04 (1 day)

# 5.

Sartori, Lorenzo (2022) Putting the ‘Experiment’ back into the ‘Thought Experiment’. Synthese, 201 (34). ISSN 1573-0964

  Send To > Keep unreadDelete

Resurfaced 1964 VRT video interview of Georges Lema\^itre. (arXiv:2301.07198v1 [physics.hist-ph]) 

from 

physics.hist-ph updates on arXiv.org

 by 

Satya Gontcho A Gontcho, Jean-Baptiste Kikwaya Eluo, Paul Gabor

Thu Jan 19 2023 09:48:43 (2 days)

# 6.

On December 31 2022, the Vlaamse Radio- en Televisieomroeporganisatie (VRT), the national public-service broadcaster for the Flemish Community of Belgium, recovered a video recording of a 1964 interview of Georges Lema\^itre. Up until now, that footage was thought to have been lost. This footage represents a unique insight into the views of the physicist often coined as the “father of the Big Bang”. The interview was conducted in French and is available online with Flemish subtitles. In an effort to make this treasure broadly available, we provide in this paper some brief context, an English translation of the interview as well as the French transcript for reference.

  Send To > Keep unreadDelete

On the ontological ambiguity of Physics facing Reality. (arXiv:2301.07297v1 [physics.hist-ph]) 

from 

physics.hist-ph updates on arXiv.org

 by 

J.E. Horvath, R. Rosas Fernandes, T.E. Idiart (Departamento de Astronomia, IAG-USP, São Paulo SP, Brazil)

Thu Jan 19 2023 09:48:42 (2 days)

# 7.

We discuss in this work the contradictory position in modern Physics between the existence of a microphysical quantum Reality and macrophysical classical one. After discussing some basic concepts in Philosophy, we revisit the situation of Quantum Mechanics results, particularly after the confirmation of violations of Bell’s Theorem, and its significance to create a tension between the micro and the macro world, which is very fundamental and unsolved.

  Send To > Keep unreadDelete

Everett interpretation and Convivial Solipsism. (arXiv:2301.07532v1 [quant-ph]) 

from 

physics.hist-ph updates on arXiv.org

 by 

Hervé Zwirn

Thu Jan 19 2023 09:48:41 (2 days)

# 8.

I show how the quantum paradoxes occurring when we adopt a standard realist framework (or a framework in which the collapse implies a physical change of the state of the system) vanish if we abandon the idea that a measurement is related (directly or indirectly) to a physical change of state. In Convivial Solipsism, similarly to Everett interpretation, there is no collapse of the wave function. But contrary to Everett interpretation, there is only one world. This allows also to get rid of any non-locality and to provide a solution to the Wigner friend problem and its more recent versions.

  Send To > Keep unreadDelete

Gravity’s Creative Core. (arXiv:2301.07657v1 [gr-qc]) 

from 

physics.hist-ph updates on arXiv.org

 by 

Julian Barbour

Thu Jan 19 2023 09:48:40 (2 days)

# 9.

I argue that the essence of gravity can be understood only in the context of the universe and that unrecognised implicit retention of Newtonian absolute scale and the impact of thermodynamics have obscured it. Typical attempts to resolve the conflict between maximal matter entropy in the early universe and the second law of thermodynamics illustrate my case. Rovelli, for example, argues that the scale factor, and with it the overall state, was out of equilibrium. He illustrates subsequent entropy-increasing interaction with other degrees of freedom in two models: particles in a box interacting with a piston initially out of equilibrium and Newtonian gravitating particles. However, the piston’s position and momentum, like the particles”, are defined relative to the box, while unobservable absolute space defines those of the gravitating particles. Their representation using observable scale-invariant variables shows that the box and gravitational statistics differ greatly: in the latter a single degree of freedom, gravity’s creative core, drives the system in every solution from entropic-like disorder to ever increasing ordered structure. Since in many ways such particles are a good approximation to general relativity, this may also be true for our universe.

  Send To > Keep unreadDelete

Observation of optical de Broglie–Mackinnon wave packets 

from 

Nature Physics

 by 

Layton A. Hall; Ayman F. Abouraddy

Thu Jan 19 2023 08:00:00 (2 days)

# 10.

Nature Physics, Published online: 19 January 2023; doi:10.1038/s41567-022-01876-6

de Broglie–Mackinnon wave packets are an extension of matter waves, but have so far remained a theoretical construct. Combining spatio-temporal light fields with anomalous dispersion has now allowed their experimental observation.

  Send To > Keep unreadDelete

Elusive phase wave caught 

from 

Nature Physics

 by 

Mbaye Diouf; Joshua A. Burrow; Kimani C. Toussaint Jr.

Thu Jan 19 2023 08:00:00 (2 days)

# 11.

Nature Physics, Published online: 19 January 2023; doi:10.1038/s41567-022-01861-z

Long-theorized, non-dispersive de Broglie wave packets have been optically synthesized using classically entangled ring-shaped space-time wave packets in a medium exhibiting anomalous dispersion.

  Send To > Keep unreadDelete

Modal-Logical Reconstructions of Thought Experiments 

from 

PhilSci-Archive: No conditions. Results ordered -Date Deposited.

Thu Jan 19 2023 07:00:23 (2 days)

# 12.

Mulder, Ruward A. and Muller, F.A. (2022) Modal-Logical Reconstructions of Thought Experiments. [Preprint]

  Send To > Keep unreadDelete

Principle Theory or Constructive Theory? 

from 

PhilSci-Archive: No conditions. Results ordered -Date Deposited.

Thu Jan 19 2023 06:58:49 (2 days)

# 13.

Luk, Robert (2023) Principle Theory or Constructive Theory? UNSPECIFIED.

  Send To > Keep unreadDelete

Relativistic Mass is an Experimental Fact 

from 

PhilSci-Archive: No conditions. Results ordered -Date Deposited.

Wed Jan 18 2023 11:42:28 (2 days)

# 14.

Petkov, Vesselin (2023) Relativistic Mass is an Experimental Fact. [Preprint]

  Send To > Keep unreadDelete

Renormalization group methods and the epistemology of effective field theories 

from 

PhilSci-Archive: No conditions. Results ordered -Date Deposited.

Tue Jan 17 2023 17:53:28 (3 days)

# 15.

Koberinski, Adam and Fraser, Doreen (2023) Renormalization group methods and the epistemology of effective field theories. [Preprint]

  Send To > Keep unreadDelete

An endless pursuit 

from 

Nature Physics

 by 

Daniel Kaplan; Michael Kaplan

Tue Jan 17 2023 08:00:00 (4 days)

# 16.

Nature Physics, Published online: 17 January 2023; doi:10.1038/s41567-022-01901-8

An endless pursuit

  Send To > Keep unreadDelete

News for the New Year 

from 

Nature Physics

Tue Jan 17 2023 08:00:00 (4 days)

# 17.

Nature Physics, Published online: 17 January 2023; doi:10.1038/s41567-022-01936-x

As 2023 begins, we look forward to some of the new things the journal will do this year and introduce the team of editors who will do them.

  Send To > Keep unreadDelete

Do We Have Any Viable Solution to the Measurement Problem? 

from 

PhilSci-Archive: No conditions. Results ordered -Date Deposited.

Tue Jan 17 2023 03:11:26 (4 days)

# 18.

Adlam, Emily (2022) Do We Have Any Viable Solution to the Measurement Problem? [Preprint]

  Send To > Keep unreadDelete

The seven laws of Quantum Mechanics : banishing the bogeys. (arXiv:2301.05436v1 [physics.hist-ph]) 

from 

physics.hist-ph updates on arXiv.org

 by 

Urjit A. Yajnik

Mon Jan 16 2023 17:49:07 (4 days)

# 19.

The laws of quantum mechanics are couched in subtle mathematical language. The laws are not usually stated in a compact pedagogical form. Here I present a possible way to correct this. Essential facts can be distilled into seven statements that are easy to remember and easily referred back. Also, the current teaching of quantum mechanics is laden with words of negative connotations, originating as they did during the early decades of the subject when the subject was intellectually still puzzling. A wide variety of experiments in the intervening decades, not least those that were awarded the Nobel Prize of 2022 amply affirm the validity and substantial “reality” of Quantum Mechanics as a theory. I take a few of the inadequacies of classical framework to illustrate that some of the complaints against Quantum Mechanics are patently misplaced. Finally I discuss the bogeys such as “wave article duality”, “uncertainty”, “indistinguishability” “statistics” and “entanglement” and advocate adopting better terminology to save new learners from the old biases.

  Send To > Keep unreadDelete

Spatio-temporally graded causality: a model. (arXiv:2204.07161v2 [q-bio.NC] CROSS LISTED) 

from 

physics.hist-ph updates on arXiv.org

 by 

Bartosz Jura

Mon Jan 16 2023 17:49:05 (4 days)

# 20.

In this work a model is proposed, according to which causality can be considered to be spatio-temporally graded. It is outlined how this can be described using the formalism of fuzzy sets theory, with the degree of causality varying between 1, that is no separation between causes and effects, and 0, that is perfect separation between causes and their effects as in classical ‘billiard balls’ models of physical systems. The model posits that subjective moments of time are like fuzzy sets, with their extension determined by local degrees of causality, resulting from information integration processes extended gradually in space and time. This, we argue, is a way in which a notion of causality could be, to a certain degree, spared and reconciled with a variant of Bergsonian duration theory as formulated in the theory of continuous change as the dimension of consciousness.

  Send To > Keep unreadDelete

Power to the particles 

from 

Nature Physics

 by 

Giovanni Lapenta

Mon Jan 16 2023 08:00:00 (5 days)

# 21.

Nature Physics, Published online: 16 January 2023; doi:10.1038/s41567-022-01864-w

Particles in space can be accelerated to high energy, the distribution of which follows a power law. This has now been reproduced in laboratory experiments mimicking astrophysical scenarios, which helps to understand the underlying mechanisms.

Article written by

editor

Please comment with your real name using good manners.

Leave a Reply

You must be logged in to post a comment.