Results 31 to 40 of about 2,908,412 (339)
Brown-York charges at null boundaries
Journal of High Energy Physics, 2022 The Brown-York stress tensor provides a means for defining quasilocal gravitational charges in subregions bounded by a timelike hypersurface. We consider the generalization of this stress tensor to null hypersurfaces.
Venkatesa Chandrasekaran +3 more
doaj +1 more source
The constraints of post-quantum classical gravity [PDF]
Journal of High Energy Physics, 2020 We study a class of theories in which space-time is treated classically, while interacting with quantum fields. These circumvent various no-go theorems and the pathologies of semi-classical gravity, by being linear in the density matrix and phase-space ...
J. Oppenheim, Zachary Weller-Davies
semanticscholar +1 more source
Scattering amplitudes, black holes and leading singularities in cubic theories of gravity [PDF]
Journal of High Energy Physics, 2019 We compute the semi-classical potential arising from a generic theory of cubic gravity, a higher derivative theory of spin-2 particles, in the framework of modern amplitude techniques.
William T. Emond, Nathan Moynihan
semanticscholar +1 more source
Torsion in the Classical Spacetime Context [PDF]
Philos. sci. 91 (2024) 1262-1273, 2023 Teleparallel gravity, an empirically equivalent counterpart to General Relativity, represents the influence of gravity using torsional forces. It raises questions about theory interpretation and underdetermination. To better understand the torsional forces of Teleparallel gravity, we consider a context in which forces are better understood: classical ...
arxiv +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
Traversable Lorentzian wormholes in higher dimensional theories of gravity [PDF]
Journal of Physics: Conference Series, 2019 Wormhole solutions in classical general relativity are unstable and hence non traversable. Morris and Thorne discovered a traversable wormhole solution that required the energy momentum tensor of matter sources to violate various energy conditions and ...
Anshuman Baruah, Atri Deshamukhya
semanticscholar +1 more source
Journal of High Energy Physics, 2020 A massive, nonrelativistic scalar field in an expanding spacetime is usually approximated by a pressureless perfect fluid, which leads to the standard conclusion that such a field can play the role of cold dark matter.
Borna Salehian +2 more
doaj +1 more source
Canonical transformation path to gauge theories of gravity-II: Space-time coupling of spin-0 and spin-1 particle fields [PDF]
International Journal of Modern Physics E, 2017 The generic form of space-time dynamics as a classical gauge field theory has recently been derived, based on only the action principle and on the principle of general relativity.
J. Struckmeier +13 more
semanticscholar +1 more source
The weak field limit of quantum matter back-reacting on classical spacetime [PDF]
Journal of High Energy Physics, 2023 Consistent coupling of quantum and classical degrees of freedom exists so long as there is both diffusion of the classical degrees of freedom and decoherence of the quantum system.
Isaac Layton +3 more
semanticscholar +1 more source
Effective field theories of post-Newtonian gravity: a comprehensive review [PDF]
Reports on progress in physics. Physical Society, 2018 This review article presents the progress made over the last decade, since the introduction of effective field theories (EFTs) into post-Newtonian (PN) gravity.
M. Levi
semanticscholar +1 more source