Weekly Papers on Quantum Foundations (43)

Spontaneous decoherence as a result of randomness in the flow of time. (arXiv:2110.11343v1 [quant-ph])

上午10:17

L.I. Rozonoer

quant-ph updates on arXiv.org

The hypothesis of the random flow of time is considered. To do this, the concepts of microscopic random time and macroscopic mean time, as well as random modular time are introduced. The possibilities of experimental verification of the hypothesis of the random flow of time are discussed.

Quantumness Beyond Entanglement: The Case of Symmetric States. (arXiv:2110.11361v1 [quant-ph])

上午10:17

Aaron Z. Goldberg, Markus Grassl, Gerd Leuchs, Luis L. Sánchez-Soto

quant-ph updates on arXiv.org

It is nowadays accepted that truly quantum correlations can exist even in the absence of entanglement. For the case of symmetric states, a physically trivial unitary transformation can alter a quantum state from entangled to separable and vice versa. We propose to certify the presence of quantumness via an average over all physically relevant modal decompositions. We investigate extremal states for such a measure: SU(2)-coherent states possess the least quantumness whereas the opposite extreme is inhabited by states with maximally spread Majorana constellations.

Topological Insulators Quantum Mechanics. (arXiv:2110.11455v1 [hep-th])

上午10:17

J. Gamboa, F. Mendez

quant-ph updates on arXiv.org

Topological insulators in three dimensions are studied as a problem of supersymmetric quantum mechanics. The spin-orbit coupling is induced as a consequence of the supersymmetrization procedure and we show that it is equivalent to the appearance of a $SU(2)$ connection. The procedure presented in this letter is general and valid for any three-dimensional quantum system. The approach allows — in principle — to study a wide range of topological insulators as standard quantum mechanical problems. As an illustration the three-dimensional harmonic oscillator and the Aharonov-Bohm effect are studied in detail.

The Cosmic Void. (arXiv:2110.11859v1 [physics.hist-ph])

上午10:17

physics.hist-ph updates on arXiv.org

Authors: Eddy Keming Chen

What exists at the fundamental level of reality? On the standard picture, the fundamental reality contains (among other things) fundamental matter, such as particles, fields, or even the quantum state. Non-fundamental facts are explained by facts about fundamental matter, at least in part. In this paper, I introduce a non-standard picture called the “cosmic void” in which the universe is devoid of any fundamental material ontology. Facts about tables and chairs are recovered from a special kind of laws that satisfy strong determinism. All non-fundamental facts are completely explained by nomic facts. I discuss a concrete example of this picture in a strongly deterministic version of the many-worlds theory of quantum mechanics. I discuss some philosophical and scientific challenges to this view, as well as some connections to ontological nihilism.

Interdimensionality. (arXiv:2110.11394v1 [physics.gen-ph])

上午10:17

gr-qc updates on arXiv.org

Authors: Karl Svozil

In this speculative analysis, interdimensionality is introduced as the (co)existence of universes embedded into larger ones. These interdimensional universes may be isolated or intertwined, suggesting a variety of interdimensional intrinsic phenomena that can only be understood in terms of the outer, extrinsic reality.

Euclid: Forecast constraints on consistency tests of the $\Lambda$CDM model. (arXiv:2110.11421v1 [astro-ph.CO])

上午10:17

gr-qc updates on arXiv.org

Authors: S. Nesseris, D. Sapone, M. Martinelli, D. Camarena, V. Marra, Z. Sakr, J. Garcia-Bellido, C.J.A.P. Martins, C. Clarkson, A. Da Silva, P. Fleury, L. Lombriser, J.P. Mimoso, S. Casas, V. Pettorino, I. Tutusaus, A. Amara, N. Auricchio, C. Bodendorf, D. Bonino, E. Branchini, M. Brescia, V. Capobianco, C. Carbone, J. Carretero, M. Castellano, S. Cavuoti, A. Cimatti, R. Cledassou, G. Congedo, L. Conversi, Y. Copin, L. Corcione, F. Courbin, M. Cropper, H. Degaudenzi, M. Douspis, F. Dubath, C.A.J. Duncan, X. Dupac, S. Dusini, A. Ealet, S. Farrens, P. Fosalba, M. Frailis, E. Franceschi, M. Fumana, B. Garilli, B. Gillis, C. Giocoli, A. Grazian, F. Grupp, S.V.H. Haugan, W. Holmes, F. Hormuth, K. Jahnke, S. Kermiche, A. Kiessling, T. Kitching, M. Kümmel, M. Kunz, H. Kurki-Suonio, S. Ligori, P.B. Lilje, et al. (51 additional authors not shown)

The standard cosmological model is based on the simplifying assumptions of a spatially homogeneous and isotropic universe on large scales. An observational detection of their violation, at any redshift, would immediately indicate the breakdown of the aforementioned assumptions or presence of new physics. We quantify the ability of the Euclid mission, together with contemporary surveys, to improve the current sensitivity of null tests of the canonical cosmological constant and cold dark matter (LCDM) model, in the redshift range $0<z<1.8$. We consider both currently available data and simulated Euclid and external data products based on a LCDM fiducial model, an evolving dark energy model assuming the Chevallier-Polarski-Linder (CPL) parametrization or an inhomogeneous Lema\^{\i}tre-Tolman-Bondi model with a cosmological constant (LLTB), and carry out two separate, albeit complementary, analyses: a machine learning reconstruction based on genetic algorithms and a theory-agnostic parametric approach based on polynomial reconstruction and binning of the data, in order not to make assumptions about any particular model. We find that using the machine learning approach Euclid can (in combination with external probes) improve current constraints on null tests of the LCDM by approximately a factor of two to three, while in the case of the binning approach, Euclid can provide tighter constraints than the genetic algorithms by a further factor of two in the case of the LCDM mock, albeit in certain cases may be biased against or missing some features of models far from LCDM, as is the case with the CPL and LLTB mocks. Our analysis highlights the importance of synergies between Euclid and other surveys, which are crucial to provide tighter constraints over an extended redshift range, for a plethora of different consistency tests of some of the main assumptions of the current cosmological paradigm.

Idealizations and analogies: Explaining critical phenomena

2021年10月24日星期日下午3:43