from
by
Matthew J. Lake, Marek Miller
Fri Dec 08 2023 12:50:44 (1 day)
# 1.
The topic of quantum reference frames (QRFs) has attracted a great deal of attention in the recent literature. Potentially, the correct description of such frames is important for both the technological applications of quantum mechanics and for its foundations, including the search for a future theory of quantum gravity. In this letter, we point out potential inconsistencies in the mainstream approach to this subject and propose an alternative definition that avoids these problems. Crucially, we reject the notion that transformations between QRFs can be represented by unitary operators and explain the clear physical reasons for this. An experimental protocol, capable of empirically distinguishing between competing definitions of the term, is also proposed. The implications of the new model, for uncertainty relations, spacetime symmetries, gauge symmetries, the quantisation of gravity, and other foundational issues are discussed, and possible directions for future work in this field are considered.
Send To > Keep unreadDelete
from
by
Paolo Massimo Bassani
Fri Dec 08 2023 12:50:34 (1 day)
# 2.
We develop the Brans-Dicke theory of gravity in the context of varying constants of Nature. Using the unimodular formalism of General Relativity, we create a platform to provide physical relational times giving the evolution of physical constants. We therefore review the ideas and experiments behind varying constants, mostly focusing on the speed of light and the gravitational constant. Then, we apply this idea to the energy conservation in cosmology, illustrating the arising patterns. Motivated by a varying gravitational constant resulting from Mach’s principle, we develop the unimodular formalism of varying constants in the Brans-Dicke theory. Doing so, we obtain several original results, some of which can be compared with phenomenological observation. Finally, we suggest how a varying Brans-Dicke parameter could be linked to the Cosmological Constant problem.
Send To > Keep unreadDelete
from
Thu Dec 07 2023 16:16:15 (2 days)
# 3.
de Ronde, Christian (2023) The Return of Realism in the Logos Approach to Quantum Mechanics (Reply to Arroyo and Arenhart). [Preprint]
Send To > Keep unreadDelete
from
Wed Dec 06 2023 15:53:17 (3 days)
# 4.
Froese, Tom and Georgii, Karelin and Takashi, Ikegami (2023) Making mind matter with irruption theory: Bridging end-directedness and entropy production by satisfying the participation criterion. [Preprint]
Send To > Keep unreadDelete
from
Wed Dec 06 2023 15:52:58 (3 days)
# 5.
Drezet, aurélien (2023) Whence Nonlocality? Removing spooky action at a distance from the de Broglie Bohm pilot-wave theory using a time-symmetric version of de Broglie double solution. [Preprint]
Send To > Keep unreadDelete
from
Wed Dec 06 2023 15:51:00 (3 days)
# 6.
Weinstein, Galina (2023) A comprehensive survey of Schwarzschild’s original papers: Schwarzschild’s trick and Einstein’s s(h)tick. [Preprint]
Send To > Keep unreadDelete
from
Wed Dec 06 2023 15:50:24 (3 days)
# 7.
Vincenzo, Crupi (2023) The case of early Copernicanism: Epistemic luck vs. predictivist vindication. [Preprint]
Send To > Keep unreadDelete
from
Wed Dec 06 2023 15:50:11 (3 days)
# 8.
Pipa, Francisco (2023) Beyond the Wigner’s friend dilemma: A new indeterminacy-based quantum theory. [Preprint]
Send To > Keep unreadDelete
from
Wed Dec 06 2023 15:49:45 (3 days)
# 9.
Fischer, Enno (2023) The Promise of Supersmmetry. [Preprint]
Send To > Keep unreadDelete
from
by
Kacper Dębski, Magdalena Zych, Fabio Costa, and Andrzej Dragan
Tue Dec 05 2023 18:00:00 (3 days)
# 10.
Author(s): Kacper Dębski, Magdalena Zych, Fabio Costa, and Andrzej Dragan
According to the general theory of relativity, time can flow at different rates depending on the configuration of massive objects, affecting the temporal order of events. Combined with quantum theory, this gravitational effect can result in events with an indefinite temporal order when a massive obj…
[Phys. Rev. A 108, 062204] Published Tue Dec 05, 2023
