The kh{\^o}ra and the two-triangle universe of Plato’s Timaeus. (arXiv:2008.11947v1 [math.HO])

上午8:56 | | | physics.hist-ph updates on arXiv.org |

Authors: Luc Brisson, Salomon Ofman (IMJ-PRG (UMR\_7586))

The main purpose of this article is to try to understand the connection between the physical universe and the mathematical principles that underlies the cosmological account of the Timaeus. Aristotle’s common criticism of Plato’s cosmology is that he confuses mathematical and physical constructions. Namely, the Timaeus is the first cosmology founded on mathematical physics. We give a new translation of Timaeus 31b-32b, an important passage to understand the connection between mathematics and physics in Timaeus’ cosmological construction. This article is the first of a series about the kh{\^o}ra. We will restrict our focus here to the much-debated question of the primary elements in the kh{\^o}ra, the components of the whole physical world reduced, in an extraordinary elegant construction, to two right triangles.

上午8:56 | | | physics.hist-ph updates on arXiv.org |

Authors: Jakub M. Ratajczak

Quantum mechanics has lacked a widely recognized interpretation since its birth. Many interpretations are under consideration because they are difficult to disprove experimentally. In this paper, we show that the results of a recent experiment go against one of them: the pilot-wave interpretation. This is because the key assumption of this interpretation, particle locality, contradicts the assumption of wave function nonlocality on which the experiment is founded. This is a rare example of a quantum model and an experiment not indifferent to the interpretation of quantum mechanics.

上午8:56 | | | Marek Czachor | | | quant-ph updates on arXiv.org |

Contrary to what Lambare [arXiv:2008.00369] assumes, in non-Newtonian calculus (a calculus based on non-Diophantine arithmetic) an integral is typically given by a nonlinear map. This is the technical reason why all the standard proofs of Bell-type inequalities fail if non-Newtonian hidden variables are taken into account. From the non-Newtonian perspective, Bell’s inequality is a property of a limited and unphysical class of hidden-variable models. An explicit counterexample to Bell’s theorem can be easily constructed.

Demystifying the Delayed-Choice Quantum Eraser. (arXiv:1908.03920v3 [quant-ph] UPDATED)

上午8:56 | | | Tabish Qureshi | | | quant-ph updates on arXiv.org |

The delayed-choice quantum eraser has long been a subject of controversy, and has been looked at as being incomprehensible to having retro-causal effect in time. Here the delayed-choice quantum eraser is theoretically analyzed using standard quantum mechanics. Employing Mach-Zehnder interferometer, instead of a conventional two-slit interference, brings in surprising clarity. Some common mistakes in interpreting the experiment are pointed out. It is demonstrated that in the delayed mode there is no which-way information present after the particle is registered on the screen or the final detectors, contrary to popular belief. However, it is shown that another kind of path information is present even after the particle is registered in the final detectors. The registered particle can be used to predict the results of certain yet to be made measurements on the which-way detector. This novel correlation can be tested in a careful experiment. It is consequently argued that there is no big mystery in the experiment, and no retro-causal effect whatsoever.

Constancy of the speed of light and the unit matching problem

上午8:56 | | | ScienceDirect Publication: Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern PhysicsScienceDirect RSShttps://www.sciencedirect.com/journal/studies-in-history-and-philosophy-of-science-part-b-studies-in-history-and-philosophy-of-modern-physicsRSS for NodeWed, 24 Jul 2019 09:46:42 GMTCopyright © 2019 Elsevier Ltd. All rights reservedImprints of the underlying structure of physical theoriesPublication date: Available online 12 July 2019Source: Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern PhysicsAuthor(s): Jorge ManeroAbstractIn the context of scientific realism, this paper intends to provide a formal and accurate description of the structural-based ontology posited by classical mechanics, quantum mechanics and special relativity, which is preserved across the empirical domains of these theories and explain their successful predictions. Along the lines of ontic structural realism, such a description is undertaken by |

Publication date: Available online 27 August 2020

**Source:** Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics

Author(s): Alon Drory

Emergence of the Circle in a Statistical Model of Random Cubic Graphs. (arXiv:2008.11779v1 [hep-th])

上午8:56 | | | gr-qc updates on arXiv.org |

Authors: Christy Kelly, Carlo Trugenberger, Fabio Biancalana

We consider a formal discretisation of Euclidean quantum gravity defined by a statistical model of random $3$-regular graphs and making using of the Ollivier curvature, a coarse analogue of the Ricci curvature. Numerical analysis shows that the Hausdorff and spectral dimensions of the model approach $1$ in the joint classical-thermodynamic limit and we argue that the scaling limit of the model is the circle of radius $r$, $S^1_r$. Given mild kinematic constraints, these claims can be proven with full mathematical rigour: speaking precisely, it may be shown that for $3$-regular graphs of girth at least $4$, any sequence of action minimising configurations converges in the sense of Gromov-Hausdorff to $S^1_r$. We also present strong evidence for the existence of a second-order phase transition through an analysis of finite size effects. This—essentially solvable—toy model of emergent one-dimensional geometry is meant as a controllable paradigm for the nonperturbative definition of random flat surfaces.The way ahead for fusion

2020年8月28日 星期五 上午8:00 | | | Nature Physics – Issue – nature.com science feeds |

Nature Physics, Published online: 28 August 2020; doi:10.1038/s41567-020-01043-9As the construction of the ITER tokamak enters its next phase — the machine assembly — now is a good time for a recap of the history and current status of nuclear fusion research.

The Non-Individuals Interpretation of Quantum Mechanics

2020年8月28日 星期五 上午2:02 | | | Philsci-Archive: No conditions. Results ordered -Date Deposited. |

Krause, Décio and Arenhart, Jonas R. B. and Bueno, Otávio (2020) The Non-Individuals Interpretation of Quantum Mechanics. [Preprint]

2020年8月24日 星期一 下午6:00 | | | Peter J. Brown and Roger Colbeck | | | PRL: General Physics: Statistical and Quantum Mechanics, Quantum Information, etc. |

Author(s): Peter J. Brown and Roger Colbeck

Alice and Bob each have half of a pair of entangled qubits. Bob measures his half and then passes his qubit to a second Bob who measures again and so on. The goal is to maximize the number of Bobs that can have an expected violation of the Clauser-Horne-Shimony-Holt (CHSH) Bell inequality with the s…

[Phys. Rev. Lett. 125, 090401] Published Mon Aug 24, 2020

Reference Frames Which Separately Store Noncommuting Conserved Quantities

2020年8月24日 星期一 下午6:00 | | | Sandu Popescu, Ana Belén Sainz, Anthony J. Short, and Andreas Winter | | | PRL: General Physics: Statistical and Quantum Mechanics, Quantum Information, etc. |

Author(s): Sandu Popescu, Ana Belén Sainz, Anthony J. Short, and Andreas Winter

Even in the presence of conservation laws, one can perform arbitrary transformations on a system if given access to a suitable reference frame, since conserved quantities may be exchanged between the system and the frame. Here we explore whether these quantities can be separated into different parts…

[Phys. Rev. Lett. 125, 090601] Published Mon Aug 24, 2020

Derivation of Classical Mechanics in an Energetic Framework via Conservation and Relativity

2020年8月24日 星期一 下午2:56 | | | Philsci-Archive: No conditions. Results ordered -Date Deposited. |

Goyal, Philip (2020) Derivation of Classical Mechanics in an Energetic Framework via Conservation and Relativity. [Preprint]No Laws and (Thin) Powers In, No (Governing) Laws Out

2020年8月23日 星期日 下午3:54 | | | Philsci-Archive: No conditions. Results ordered -Date Deposited. |

Ioannidis, Stavros and Livanios, Vassilis and Psillos, Stathis (2020) No Laws and (Thin) Powers In, No (Governing) Laws Out. [Preprint]Holography without holography: How to turn inter-representational into intra-theoretical relations in AdS/CFT

2020年8月23日 星期日 下午3:50 | | | Philsci-Archive: No conditions. Results ordered -Date Deposited. |

Jaksland, Rasmus and Linnemann, Niels (2020) Holography without holography: How to turn inter-representational into intra-theoretical relations in AdS/CFT. Studies in History and Philosophy of Modern Physics, 71. pp. 101-117. ISSN 1355-2198The Dynamical Approach to Spin-2 Gravity

2020年8月23日 星期日 下午3:48 | | | Philsci-Archive: No conditions. Results ordered -Date Deposited. |

Salimkhani, Kian (2020) The Dynamical Approach to Spin-2 Gravity. Studies in History and Philosophy of Modern Physics. ISSN 1355-2198Jury Theorems for Peer Review

2020年8月22日 星期六 下午3:18 | | | Philsci-Archive: No conditions. Results ordered -Date Deposited. |

Arvan, Marcus and Bright, Liam Kofi and Heesen, Remco (2020) Jury Theorems for Peer Review. [Preprint]Jump Ship, Shift Gears, or Just Keep on Chugging: Assessing the Responses to Tensions between Theory and Evidence in Contemporary Cosmology

2020年8月22日 星期六 下午3:17 | | | Philsci-Archive: No conditions. Results ordered -Date Deposited. |

De Baerdemaeker, Siska and Boyd, Nora Mills (2020) Jump Ship, Shift Gears, or Just Keep on Chugging: Assessing the Responses to Tensions between Theory and Evidence in Contemporary Cosmology. [Preprint]