Weekly Papers on Quantum Foundations (31)

A preference for Dynamical Dark Energy?. (arXiv:2107.14129v1 [astro-ph.CO])

上午9:55|gr-qc updates on arXiv.org

Authors: David BenistyDenitsa Staicova

Dynamical Dark Energy (DDE) is a possible solution to the Hubble tension. This work analyses the combination of Baryon Acoustic Oscillation (BAO) data that include $19$ points from the range $0.11 \le z \le 2.40$ and additional points from the Cosmic Microwave Background (CMB) Distant Priors. We test equation of states with a Linear, CPL and a Logarithm dependence on the redshift. DDE seems to be stronger then the standard $\Lambda$CDM model statistically using different selection criteria. The result calls for new observations and stimulates the investigation of alternative theoretical models beyond the standard model. We also test the same dataset on the $\Omega_k$CDM model but for it, $\Lambda$CDM gives better statistical measures.

Holography of time machines. (arXiv:2107.14200v1 [hep-th])

上午9:55|gr-qc updates on arXiv.org

Authors: Roberto EmparanMarija Tomašević

We use holography to examine the response of quantum fields to the appearance of closed timelike curves in a dynamically evolving background that initially does not contain them. For this purpose, we study a family of two-dimensional spacetimes that model very broad classes of wormhole time machines. The behavior of conformal theories in these spacetimes is then holographically described by three-dimensional AdS bulk geometries that we explicitly construct. The dual bulk spacetime is free from any divergences, but splits into two disconnected components, without and with CTCs, which are joined only through the boundary; this implies that passages across the chronology horizon are impossible for observers with finite energy. The bulk region with CTCs is a geodesically incomplete spacetime. Therefore, the bulk enforces the chronology protection principle in the most explicit manner — by completely separating the pathological part from the rest of the spacetime.

Are Points (Necessarily) Unextended?

上午4:21|Philsci-Archive: No conditions. Results ordered -Date Deposited.

Ehrlich, Philip (2021) Are Points (Necessarily) Unextended? [Preprint]

Bell Nonlocality Is Not Sufficient for the Security of Standard Device-Independent Quantum Key Distribution Protocols

2021年7月29日 星期四 下午6:00|Máté Farkas, Maria Balanzó-Juandó, Karol Łukanowski, Jan Kołodyński, and Antonio Acín|PRL: General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

Author(s): Máté Farkas, Maria Balanzó-Juandó, Karol Łukanowski, Jan Kołodyński, and Antonio Acín

Bell nonlocality is insufficient to ensure the security of a type of secure quantum-communications protocol known as DI-QKD.

[Phys. Rev. Lett. 127, 050503] Published Thu Jul 29, 2021

Unitary Interactions Do Not Yield Outcomes: Attempting to Model “Wigner’s Friend”

2021年7月26日 星期一 下午3:54|Philsci-Archive: No conditions. Results ordered -Date Deposited.

Kastner, Ruth (2021) Unitary Interactions Do Not Yield Outcomes: Attempting to Model “Wigner’s Friend”. [Preprint]

Physics, time and qualia

2021年7月26日 星期一 下午3:51|Philsci-Archive: No conditions. Results ordered -Date Deposited.

Verde, Clelia and Smolin, Lee (2021) Physics, time and qualia. [Preprint]

The Everett Interpretation: probability

2021年7月26日 星期一 下午3:51|Philsci-Archive: No conditions. Results ordered -Date Deposited.

Saunders, Simon (2021) The Everett Interpretation: probability. [Preprint]

On the Relation of the Laws of Thermodynamics to Statistical Mechanics

2021年7月26日 星期一 下午3:50|Philsci-Archive: No conditions. Results ordered -Date Deposited.

Myrvold, Wayne C. (2021) On the Relation of the Laws of Thermodynamics to Statistical Mechanics. [Preprint]

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