3 research outputs found
A note on the Deser-Tekin charges
Perturbed equations for an arbitrary metric theory of gravity in
dimensions are constructed in the vacuum of this theory. The nonlinear part
together with matter fields are a source for the linear part and are treated as
a total energy-momentum tensor. A generalized family of conserved currents
expressed through divergences of anti-symmetrical tensor densities
(superpotentials) linear in perturbations is constructed. The new family
generalizes the Deser and Tekin currents and superpotentials in quadratic
curvature gravity theories generating Killing charges in dS and AdS vacua. As
an example, the mass of the -dimensional Schwarzschild black hole in an
effective AdS spacetime (a solution in the Einstein-Gauss-Bonnet theory) is
examined.Comment: LATEX, 7 pages, no figure
Noether and Belinfante corrected types of currents for perturbations in the Einstein-Gauss-Bonnet gravity
In the framework of an arbitrary -dimensional metric theory, perturbations
are considered on arbitrary backgrounds that are however solutions of the
theory. Conserved currents for perturbations are presented following two known
prescriptions: canonical N{\oe}ther theorem and Belinfante symmetrization rule.
Using generalized formulae, currents in the Einstein-Gauss-Bonnet (EGB) gravity
for arbitrary types of perturbations on arbitrary curved backgrounds (not only
vacuum) are constructed in an explicit covariant form. Special attention is
paid to the energy-momentum tensors for perturbations which are an important
part in the structure of the currents. We use the derived expressions for two
applied calculations: a) to present the energy density for weak flat
gravitational waves in -dimensional EGB gravity; b) to construct the mass
flux for the Maeda-Dadhich-Molina 3D radiating black holes of a Kaluza-Klein
type in 6D EGB gravity.Comment: 22 pages, no figures, version accepted to CQ