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Horizon-scale tests of gravity theories and fundamental physics from the Event Horizon Telescope image of Sagittarius A ∗ [PDF]
Classical and quantum gravity, 2022 Horizon-scale images of black holes (BHs) and their shadows have opened an unprecedented window onto tests of gravity and fundamental physics in the strong-field regime.
S. Vagnozzi +3 more
semanticscholar +1 more source
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
semanticscholar +1 more source
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
semanticscholar +1 more source
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
Decoherence of cosmological perturbations from boundary terms and the non-classicality of gravity [PDF]
Journal of High Energy Physics, 2022 We note that the decoherence of inflationary curvature perturbation ζ is dominated by a boundary term of the gravity action. Although this boundary term cannot affect cosmological correlators 〈 ζ ^ n 〉, it induces much faster decoherence for ζ than that ...
C. Sou, Duc-Huy Tran, Yi Wang
semanticscholar +1 more source
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
Generating cosmological perturbations in non-singular Horndeski cosmologies
Journal of High Energy Physics, 2023 We construct a concrete model of Horndeski bounce with strong gravity in the past. Within this model we show that the correct spectra of cosmological perturbations may be generated at early contracting epoch, with mild fine-tuning ensuring that the ...
Yulia Ageeva +2 more
doaj +1 more source
Distinguishable consequence of classical gravity on quantum matter [PDF]
Phys. Rev. Lett. 134, 061501 (2025), 2023 What if gravity is classical? If true, a consistent co-existence of classical gravity and quantum matter requires that gravity exhibit irreducible fluctuations. These fluctuations can mediate classical correlations, but not quantum entanglement, between the quantized motion of the gravitationally interacting matter.
arxiv +1 more source