Results 71 to 80 of about 186,264 (366)
Quantum Equivalence of $f(R)$ Gravity and Scalar-tensor Theories in the Jordan and Einstein Frames [PDF]
, 2017 The $f(R)$ gravity and scalar-tensor theory are known to be equivalent at the classical level. We study if this equivalence is valid at the quantum level. There are two descriptions of the scalar-tensor theory in the Jordan and Einstein frames.
N. Ohta
semanticscholar +1 more source
A new geometric flow on 3-manifolds: the K-flow
Journal of High Energy Physics, 2023 We define a new geometric flow, which we shall call the K-flow, on 3-dimensional Riemannian manifolds; and study the behavior of Thurston’s model geometries under this flow both analytically and numerically.
Kezban Tasseten, Bayram Tekin
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Null infinity as an open Hamiltonian system
Journal of High Energy Physics, 2021 When a system emits gravitational radiation, the Bondi mass decreases. If the Bondi energy is Hamiltonian, it can thus only be a time-dependent Hamiltonian. In this paper, we show that the Bondi energy can be understood as a time-dependent Hamiltonian on
Wolfgang Wieland
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Ghost free mimetic massive gravity
Journal of High Energy Physics, 2018 The mass of the graviton can be generated using a Brout-Englert-Higgs mechanism with four scalar fields. We show that when one of these fields is costrained as in mimetic gravity, the massive gravity obtained is ghost free and consistent.
Ali H. Chamseddine, Viatcheslav Mukhanov
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Corners of gravity: the case of gravity as a constrained BF theory
Journal of High Energy Physics, 2021 Following recent works on corner charges we investigate the boundary structure in the case of the theory of gravity formulated as a constrained BF theory.
Remigiusz Durka, Jerzy Kowalski-Glikman
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Quantum Histories and Quantum Gravity
, 2009 This paper reviews the histories approach to quantum mechanics. This discussion is then applied to theories of quantum gravity. It is argued that some of the quantum histories must approximate (in a suitable sense) to classical histories, if the correct ...
A W J +47 more
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Double layers in gravity theories [PDF]
, 2014 Gravitational double layers, unlike their classical electromagnetic counterparts, are thought to be forbidden in gravity theories. It has been recently shown, however, that they are feasible in, for instance, gravity theories with a Lagrangian quadratic ...
Senovilla, José M. M.
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Singularity-free classical theory of gravity
Physical Review DWe present a classical theory of gravity, which is singularity free at short distances and reduces to General Relativity at large distances. We discuss its implications.
Saurya Das, Mitja Fridman, Sourav Sur
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Monodromy inflation and an emergent mechanism for stabilising the cosmological constant
Journal of High Energy Physics, 2019 We show that a pair of field theory monodromies in which the shift symmetry is broken by small, well motivated deformations, naturally incorporates a mechanism for cancelling off radiative corrections to the cosmological constant.
Antonio Padilla
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, 2015 No-hair theorems in theories of gravity with a scalar field are briefly and critically reviewed. Their significance and limitations are discussed and potential evasions are considered.Comment: 16 pages, contribution to the Classical and Quantum Gravity ...
Sotiriou, Thomas P.
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