Results 21 to 30 of about 186,264 (366)
Any consistent coupling between classical gravity and quantum matter is fundamentally irreversible [PDF]
Quantum, 2023 When gravity is sourced by a quantum system, there is tension between its role as the mediator of a fundamental interaction, which is expected to acquire nonclassical features, and its role in determining the properties of spacetime, which is inherently ...
Thomas D. Galley +2 more
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Classical and quantum gravity with fractional operators [PDF]
Classical and quantum gravity, 2021 Following the same steps made for a scalar field in a parallel publication, we propose a class of perturbative theories of quantum gravity based on fractional operators, where the kinetic operator of the graviton is made of either fractional derivatives ...
G. Calcagni
semanticscholar +1 more source
The off-shell recursion for gravity and the classical double copy for currents [PDF]
Journal of High Energy Physics, 2021 We construct the off-shell recursion for gravity and the graviton current for the perturbative double field theory (DFT). We first formulate the perturbative DFT, which is equivalent but simpler to perturbative general relativity, to all-orders in ...
Kyoungho Cho, Kwangeon Kim, Kanghoon Lee
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The non-relativistic geometric trinity of gravity [PDF]
General Relativity and Gravitation, 2023 The geometric trinity of gravity comprises three distinct formulations of general relativity: (i) the standard formulation describing gravity in terms of spacetime curvature, (ii) the teleparallel equivalent of general relativity describing gravity in ...
William J. Wolf, James Read
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Eikonal phase matrix, deflection angle, and time delay in effective field theories of gravity [PDF]
Physical Review D, 2020 The eikonal approximation is an ideal tool to extract classical observables in gauge theory and gravity directly from scattering amplitudes. Here we consider effective theories of gravity where in addition to the Einstein-Hilbert term we include non ...
Manuel Accettulli Huber +3 more
semanticscholar +1 more source
Doomsdays in a modified theory of gravity: A classical and a quantum approach
Physics Letters B, 2017 By far cosmology is one of the most exciting subject to study, even more so with the current bulk of observations we have at hand. These observations might indicate different kinds of doomsdays, if dark energy follows certain patterns. Two of these doomsdays are the Little Rip (LR) and Little Sibling of the Big Rip (LSBR).
Imanol Albarran +3 more
openalex +6 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 +3 more
doaj +1 more source
Isolated surfaces and symmetries of gravity [PDF]
Physical Review D, 2021 Conserved charges in theories with gauge symmetries are supported on codimension-2 surfaces in the bulk. It has recently been suggested that various classical formulations of gravity dynamics display different symmetries, and paying attention to the ...
Luca Ciambelli, R. Leigh
semanticscholar +1 more source
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
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Superluminality in DHOST theory with extra scalar
Journal of High Energy Physics, 2021 We consider DHOST Ia theory interacting gravitationally with an additional conventional scalar field minimally coupled to gravity. At the linearized level of perturbations about cosmological background, we find that in the presence of a slowly rolling ...
S. Mironov, V. Rubakov, V. Volkova
doaj +1 more source