| 2021年11月15日 星期一 下午6:18 | | | Philsci-Archive: No conditions. Results ordered -Date Deposited. |
Healey, Richard (2021) Beyond Bell? [Preprint]
Quantum technologies need a quantum energy initiative. (arXiv:2111.09241v2 [quant-ph] UPDATED)
| 上午9:19 | | | A. Auffèves | | | quant-ph updates on arXiv.org |
Quantum technologies are currently the object of high expectations from governments and private companies, as they hold the promise to shape safer and faster ways to exchange and treat information. However, despite its major potential impact for industry and society, the question of their energetic footprint has remained in a blind spot of current deployment strategies. In this Perspective, I argue that quantum technologies must urgently plan for the creation and structuration of a transverse quantum energy initiative, connecting quantum thermodynamicists, computer scientists, experimenters and engineers. Such initiative is the only path towards sustainable quantum technologies, help reducing the cost of classical information processing, and possibly bring out an energetic quantum advantage.
The Quantum Eraser Paradox. (arXiv:2111.09347v1 [quant-ph])
| 上午9:19 | | | physics.hist-ph updates on arXiv.org |
Authors: Colm Bracken, Jonte R. Hance, Sabine Hossenfelder
The Delayed-Choice Quantum Eraser experiment is commonly interpreted as implying that in quantum mechanics a choice made at one time can influence an earlier event. We here suggest an extension of the experiment that results in a paradox when interpreted using a local realist interpretation combined with backward causation (“retrocausality”). We argue that resolving the paradox requires giving up the idea that, in quantum mechanics, a choice can influence the past, and that it instead requires a violation of Statistical Independence without retrocausality. We speculate what the outcome of the experiment would be.
| 上午9:19 | | | gr-qc updates on arXiv.org |
Authors: Andrew J. S. Hamilton
This paper presents a pedagogical introduction to the issue of how to implement Lorentz transformations in relativistic visualization. The most efficient approach is to use the even geometric algebra in 3+1 spacetime dimensions, or equivalently complex quaternions, which are fast, compact, and robust, and straightforward to compose, interpolate, and spline. The approach has been incorporated into the Black Hole Flight Simulator, an interactive general relativistic ray-tracing program developed by the author.
Embedding Causal Sets into Minkowski Spacetime. (arXiv:2111.09331v1 [gr-qc])
| 上午9:19 | | | gr-qc updates on arXiv.org |
Authors: Steven Johnston
We present a new method for embedding a causal set into an interval of Minkowski spacetime. The method uses spacetime volumes for causally related elements to define causal set analogs of Minkowski inner products. These are used to construct matrices of inner products which are then factored using the singular value decomposition to give coordinates in Minkowski spacetime. Results are presented showing good quality embeddings into Minkowski spacetime for dimensions d=2,3,4. The method applies in any dimension and does not require spacelike distances to be used as an input. It offers a new way to define spatial orientation and spacelike distances in a causal set.
Islands in Multiverse Models. (arXiv:2108.01278v2 [hep-th] UPDATED)
| 上午9:19 | | | gr-qc updates on arXiv.org |
Authors: Sergio E. Aguilar-Gutierrez, Aidan Chatwin-Davies, Thomas Hertog, Natalia Pinzani-Fokeeva, Brandon Robinson
We consider multiverse models in two-dimensional linear dilaton-gravity theories as toy models of false vacuum eternal inflation. Coupling conformal matter we calculate the Von Neumann entropy of subregions. When these are sufficiently large we find that an island develops covering most of the rest of the multiverse, leading to a Page-like transition. This resonates with a description of multiverse models in semiclassical quantum cosmology, where a measure for local predictions is given by saddle point geometries which coarse-grain over any structure associated with eternal inflation beyond one’s patch.
| 2021年11月19日 星期五 下午5:55 | | | Philsci-Archive: No conditions. Results ordered -Date Deposited. |
Merritt, David (2021) MOND and Methodology. Karl Popper’s Science and Philosophy. pp. 69-96.
Autonomy generalised; or, Why doesn’t physics matter more?
| 2021年11月19日 星期五 下午5:54 | | | Philsci-Archive: No conditions. Results ordered -Date Deposited. |
Robertson, Katie (2021) Autonomy generalised; or, Why doesn’t physics matter more? [Preprint]
What’s so special about initial conditions? Understanding the past hypothesis in directionless time
| 2021年11月19日 星期五 下午5:50 | | | Philsci-Archive: No conditions. Results ordered -Date Deposited. |
Farr, Matt (2021) What’s so special about initial conditions? Understanding the past hypothesis in directionless time. [Preprint]
The physics and metaphysics of Tychistic Bohmian Mechanics
| 2021年11月15日 星期一 下午6:20 | | | Philsci-Archive: No conditions. Results ordered -Date Deposited. |
Duerr, Patrick and Ehmann, Alexander (2021) The physics and metaphysics of Tychistic Bohmian Mechanics. Stuidies in History and Philosophy of Science Part A, 90. pp. 168-183.
