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Weekly Papers on Quantum Foundations (36-37)

The paradox of infinitesimal granularity: Chaos and the reversibility of time in Newton’s theory of gravity. (arXiv:2209.03347v1 [nlin.CD])   from  gr-qc updates on arXiv.org  by  Simon Portegies Zwart, Tjarda Boekholt Sat Sep 10 2022 09:48:11 (1 hour) # 1. The fundamental laws of physics are time-symmetric, but our macroscopic experience contradicts this. The time reversibility paradox is partly a consequence… Read more →

Weekly Papers on Quantum Foundations (36-37)

The paradox of infinitesimal granularity: Chaos and the reversibility of time in Newton’s theory of gravity. (arXiv:2209.03347v1 [nlin.CD])   from  gr-qc updates on arXiv.org  by  Simon Portegies Zwart, Tjarda Boekholt Sat Sep 10 2022 09:48:11 (1 hour) # 1. The fundamental laws of physics are time-symmetric, but our macroscopic experience contradicts this. The time reversibility paradox is partly a consequence… Read more →

Weekly Papers on Quantum Foundations (35)

A healthier semi-classical dynamics. (arXiv:2208.11722v1 [quant-ph]) 上午10:02 | Isaac Layton, Jonathan Oppenheim, Zachary Weller-Davies | quant-ph updates on arXiv.org We study the back-reaction of quantum systems onto classical ones. Taking the starting point that semi-classical physics should be described at all times by a point in classical phase space and a quantum state in Hilbert space, we consider an unravelling… Read more →

Weekly Papers on Quantum Foundations (34)

Russell on Weyl’s unified field theory. (arXiv:2208.08495v1 [physics.hist-ph]) 上午10:36 | physics.hist-ph updates on arXiv.org Authors: C. Romero In 1918, H. Weyl proposed a unified theory of gravity and electromagnetism based on a generalization of Riemannian geometry. With hindsight we now could say that the theory carried with it some of the most original ideas that inspired the physics of the twentieth… Read more →

Weekly Papers on Quantum Foundations (33)

What Represents Space-time? And What Follows for Substantivalism \emph{vs.} Relationalism and Gravitational Energy?. (arXiv:2208.05946v1 [physics.hist-ph]) 上午9:40 | physics.hist-ph updates on arXiv.org Authors: J. Brian Pitts The questions of what represents space-time in GR, the status of gravitational energy, the substantivalist-relationalist issue, and the (non)exceptional status of gravity are interrelated. If space-time has energy-momentum, then space-time is substantival. Two extant ways to… Read more →

Weekly Papers on Quantum Foundations (32)

Fundamental Limitation on the Detectability of Entanglement. (arXiv:2208.02518v1 [quant-ph]) 上午10:42 | Pengyu Liu, Zhenhuan Liu, Shu Chen, Xiongfeng Ma | quant-ph updates on arXiv.org Entanglement detection is essential in quantum information science and quantum many-body physics. It has been proved that entanglement exists almost surely for a random quantum state, while the realizations of effective entanglement criteria usually consume exponential… Read more →

Weekly Papers on Quantum Foundations (31)

Time-energy uncertainty relation for noisy quantum metrology. (arXiv:2207.13707v1 [quant-ph]) 上午9:19 | Philippe Faist, Mischa P. Woods, Victor V. Albert, Joseph M. Renes, Jens Eisert, John Preskill | quant-ph updates on arXiv.org Detection of weak forces and precise measurement of time are two of the many applications of quantum metrology to science and technology. We consider a quantum system initialized in… Read more →

Weekly Papers on Quantum Foundations (30)

How to Explain the Direction of Time 上午10:34 | Philsci-Archive: No conditions. Results ordered -Date Deposited. Fernandes, Alison (2022) How to Explain the Direction of Time. [Preprint] Homodyne measurement with a Schr\”odinger cat state as a local oscillator. (arXiv:2207.10210v1 [quant-ph]) 上午8:55 | Joshua Combes, Austin P. Lund | quant-ph updates on arXiv.org Homodyne measurements are a widely used quantum measurement…. Read more →

Weekly Papers on Quantum Foundations (29)

Gomes, Henrique and Butterfield, Jeremy (2022) How to Choose a Gauge? The case of Hamiltonian Electromagnetism.  Gao, Shan (2022) If the global phase is real. [Preprint] An Armstrongian Defense of Dispositional Monist Accounts of Laws of Nature 上午1:13 | Philsci-Archive: No conditions. Results ordered -Date Deposited. Mohammadian, Mousa (2022) An Armstrongian Defense of Dispositional Monist Accounts of Laws of Nature. [Preprint] A reductive account of “before”: deriving… Read more →

Weekly Papers on Quantum Foundations (28)

Gravity entanglement, quantum reference systems, degrees of freedom. (arXiv:2207.03138v1 [quant-ph]) 上午9:51 | Marios Christodoulou, Andrea Di Biagio, Richard Howl, Carlo Rovelli | quant-ph updates on arXiv.org We discuss the physical interpretation of the gravity mediated entanglement effect. We show how to read it in terms of quantum reference systems. We pinpoint the single gravitational degree of freedom mediating the entanglement…. Read more →

If the global phase is real

The ontological meaning of the wave function has been debated for many years. A widely-discussed view is wave function realism, according to which the wave function represents a real physical field in a fundamental high-dimensional space. In this paper, I argue that wave function realism is inconsistent with the reality of the global phase. In other words, the global phase… Read more →