Results 21 to 30 of about 178,359 (292)

Mimetic massive gravity: beyond linear approximation

Journal of High Energy Physics, 2018
We present a theory of ghost-free massive gravity where the mass of the graviton is generated through the Brout-Englert-Higgs (BEH) mechanism and one of the four scalar fields used is that of mimetic gravity.
Ali H. Chamseddine, Viatcheslav Mukhanov
doaj   +1 more source

Weyl doubling

Journal of High Energy Physics, 2020
We study a host of spacetimes where the Weyl curvature may be expressed algebraically in terms of an Abelian field strength. These include Type D spacetimes in four and higher dimensions which obey a simple quadratic relation between the field strength ...
Rashid Alawadhi, David S. Berman, Bill Spence   +2 more
doaj   +1 more source

The cosmological constant as a boundary term

Journal of High Energy Physics, 2022
We compare the path integral for transition functions in unimodular gravity and in general relativity. In unimodular gravity the cosmological constant is a property of states that are specified at the boundaries whereas in general relativity the ...
Wilfried Buchmüller, Norbert Dragon
doaj   +1 more source

Classical Symmetries of Some Two-Dimensional Models Coupled to Gravity [PDF]

, 1995
This paper is a sequel to one in which we examined the affine symmetry algebras of arbitrary classical principal chiral models and symmetric space models in two dimensions. It examines the extension of those results in the presence of gravity.
Bakas, Bakas, Breitenlohner, Breitenlohner, Dolan, Dolan, Duff, Duff, Font, Giveon, Goddard, Greene, John H. Schwarz, Julia, Julia, Julia, Julia, Kachru, Montonen, Osborne, Rey, Schwarz, Schwarz, Sen, Sen, Sen, Strominger, Wu   +27 more
core   +2 more sources

Massive spin-2 scattering and asymptotic superluminality

Journal of High Energy Physics, 2018
We place model-independent constraints on theories of massive spin-2 particles by considering the positivity of the phase shift in eikonal scattering. The phase shift is an asymptotic S-matrix observable, related to the time delay/advance experienced by ...
Kurt Hinterbichler, Austin Joyce, Rachel A. Rosen   +2 more
doaj   +1 more source

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
doaj   +1 more source

Discrete structures in gravity [PDF]

, 2000
Discrete approaches to gravity, both classical and quantum, are reviewed briefly, with emphasis on the method using piecewise-linear spaces. Models of 3-dimensional quantum gravity involving 6j-symbols are then described, and progress in generalising ...
Ambjørn J., Archer F. J., Baez J., Baez J., Barrett J. W., Barrett J. W., Barrett J. W., Barrett J. W., Barrett J. W., Barrett J. W., Barrett J. W., Birmingham D., Birmingham D., Brewin L., Brewin L., Carfora M., Caselle M., Correia da Silva C. L. B., Correia da Silva C. L. B., Franzosi R., Franzosi R., Freidel L., Freidel L., Gott J. R., Hamber H. W., Hamber H. W., Hartle J. B., Hasslacher B., Hollmann H. R., Immirzi G., Ionicioiu R., Ionicioiu R., Iwasaki J., Kauffman L. H., Mannion C. L., Markopoulou F., Markopoulou F., Menotti P., Ooguri H., Reisenberger M., Reisenberger M., Reisenberger M., Riedler J., Roberts J. D., Roček M., Ruth M. Williams, Schleich K., Schleich K., Tullio Regge, Turaev V. G., Waelbroeck H., Welling M., Williams R. M., ’t Hooft G., ’t Hooft G.   +54 more
core   +2 more sources

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
doaj   +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
doaj   +1 more source

Lagrangian constraint analysis of first-order classical field theories with an application to gravity [PDF]

Physical Review D, 2020
We present a method that is optimized to explicitly obtain all the constraints and thereby count the propagating degrees of freedom in (almost all) manifestly first order classical field theories. Our proposal uses as its only inputs a Lagrangian density and the identification of the a priori independent field variables it depends on.
Verónica Errasti Díez, Markus Maier, Julio A. Méndez-Zavaleta, Mojtaba Taslimi Tehrani   +3 more
openaire   +4 more sources