Results 21 to 30 of about 166,017,541 (302)

Classical Teichmüller theory and (2+1) gravity [PDF]

Physics Letters B, 1998
11 pages ...
BENEDETTI, RICCARDO, GUADAGNINI, ENORE
openaire   +3 more sources

A Postquantum Theory of Classical Gravity?

Physical Review X, 2023
The effort to discover a quantum theory of gravity is motivated by the need to reconcile the incompatibility between quantum theory and general relativity. Here, we present an alternative approach by constructing a consistent theory of classical gravity coupled to quantum field theory.
openaire   +4 more sources

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

Recursion in the classical limit and the neutron-star Compton amplitude

Journal of High Energy Physics, 2023
We study the compatibility of recursive techniques with the classical limit of scattering amplitudes through the construction of the classical Compton amplitude for general spinning compact objects.
Kays Haddad
doaj   +1 more source

Late time acceleration in Palatini gravity

Journal of High Energy Physics, 2022
We investigate the effect of the quadratic correction αR 2 and non-minimal coupling ξϕ 2 R on a quintessence model with an exponential potential V(ϕ) = M 4exp(−λϕ) in the Palatini formulation of gravity.
Ignatios Antoniadis, Anthony Guillen, Kyriakos Tamvakis   +2 more
doaj   +1 more source

A new approach and code for spinning black holes in modified gravity [PDF]

, 2023
We discuss and implement a spectral method approach to computing stationary and axisymmetric black hole solutions and their properties in modified theories of gravity.
David J Mulryne, Mulryne, DJ, Fernandes, PGS, Fernandes, Pedro G. S., Mulryne, David J., Pedro G S Fernandes   +5 more
core   +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, Éanna É. Flanagan, Ibrahim Shehzad, Antony J. Speranza   +3 more
doaj   +1 more source

Cuscuton gravity as a classically stable limiting curvature theory [PDF]

Journal of Cosmology and Astroparticle Physics, 2020
Finding effective theories of modified gravity that can resolve cosmological singularities and avoid other physical pathologies such as ghost and gradient instabilities has turned out to be a rather difficult task. The concept of limiting curvature, where one bounds a finite number of curvature-invariant functions thanks to constraint equations, is a ...
Quintin, Jerome, Yoshida, Daisuke
openaire   +4 more sources

Hamilton–Jacobi Wave Theory in Manifestly-Covariant Classical and Quantum Gravity [PDF]

Symmetry, 2019
The axiomatic geometric structure which lays at the basis of Covariant Classical and Quantum Gravity Theory is investigated. This refers specifically to fundamental aspects of the manifestly-covariant Hamiltonian representation of General Relativity which has recently been developed in the framework of a synchronous deDonder–Weyl variational ...
Cremaschini, Claudio, Tessarotto, Massimo   +1 more
openaire   +7 more sources

4D spin-2 fields from 5D Chern-Simons theory

Journal of High Energy Physics, 2018
We consider a 5-dimensional Chern-Simons gauge theory for the isometry group of Anti-de-Sitter spacetime, AdS4+1 ≃ SO(4, 2), and invoke different dimensional reduction schemes in order to relate it to 4-dimensional spin-2 theories.
N. L. González Albornoz, D. Lüst, S. Salgado, A. Schmidt-May   +3 more
doaj   +1 more source