Results 11 to 20 of about 166,017,541 (302)

Classical theories of gravity produce entanglement [PDF]

Nature
Abstract The unification of gravity and quantum mechanics remains one of the most profound open questions in science. With recent advances in quantum technology, an experimental idea first proposed by Richard Feynman 1 is now regarded as a promising route to testing this ...
Richard Howl
exaly   +5 more sources

Gravity, Quantum Fields and Quantum Information: Problems with Classical Channel and Stochastic Theories

Entropy, 2022
In recent years an increasing number of papers have attempted to mimic or supplant quantum field theory in discussions of issues related to gravity by the tools and through the perspective of quantum information theory, often in the context of alternative quantum theories. In this article, we point out three common problems in such treatments.
Charis Anastopoulos, Bei-Lok Hu
exaly   +6 more sources

Quantum field theory with classical sources—linearized quantum gravity [PDF]

Classical and Quantum Gravity, 2018
Abstract In a previous work (Skagerstam 2018 arXiv: 1801.09947v1 [quant-ph] ) and in terms of an exact quantum-mechanical framework, -independent causal and retarded expectation values of the second-quantized electro-magnetic fields ...
Bo-Sture K Skagerstam, Karl-Erik Eriksson, Per K Rekdal   +2 more
openaire   +3 more sources

Entanglement in Markovian hybrid classical-quantum theories of gravity

Physical Review D
Markovian master equations underlie many areas of modern physics and, despite their apparent simplicity, they encode a rich and complex dynamics which is still under active research. We identify a class of continuous variable Markovian master equations for which positivity and complete positivity become equivalent.
Matteo Carlesso
exaly   +4 more sources

The viability of modified gravity theories [PDF]

, 2009
PhDThis thesis studies the viability of classes of modified gravity (MG) theories based on generalisations of the Einstein-Hilbert action. Particular emphasis is given to f(R) theories in both the metric and Palatini formalisms, scalar-tensor theories ...
Uddin, Kotub
core   +4 more sources

Supersymmetric backgrounds in (1 + 1) dimensions and inhomogeneous field theory

Journal of High Energy Physics, 2023
We find a (1 + 1)-dimensional metric solution for a background hosting various supersymmetric field theories with a single non-chiral real supercharge. This supersymmetric background is globally hyperbolic even though it contains a naked null singularity.
Jeongwon Ho, O-Kab Kwon, Sang-A Park, Sang-Heon Yi   +3 more
doaj   +1 more source

Conformal wave expansions for flat space amplitudes

Journal of High Energy Physics, 2021
The extended BMS algebra contains a conformal subgroup that acts on the celestial sphere as SO(1, 3). It is of interest to perform mode expansions of free fields in Minkowski spacetime that realize this symmetry in a simple way.
Chang Liu, David A. Lowe
doaj   +1 more source

Classical gravity coupled to Liouville theory [PDF]

Nuclear Physics B, 1993
24 pages (important changes)
Mazzitelli, Francisco D., Mohammedi, Noureddine   +1 more
openaire   +3 more sources

To Half-Be or Not To Be?

Journal of High Energy Physics, 2023
It has recently been argued that half degrees of freedom could emerge in Lorentz and parity invariant field theories, using a non-linear Proca field theory dubbed Proca-Nuevo as a specific example.
Claudia de Rham, Sebastian Garcia-Saenz, Lavinia Heisenberg, Victor Pozsgay, Xinmiao Wang   +4 more
doaj   +1 more source

3D gravity with dust: Classical and quantum theory [PDF]

Physical Review D, 2015
We study the Einstein gravity and dust system in three spacetime dimensions as an example of a non-perturbative quantum gravity model with local degrees of freedom. We derive the Hamiltonian theory in the dust time gauge and show that it has a rich class of exact solutions.
Husain, Viqar, Ziprick, Jonathan
openaire   +2 more sources