RT Journal Article
T1 Modified gravity as a diagravitational medium
A1 Ruiz Cembranos, José Alberto
A1 Coma Díaz, Mario
A1 Martín Moruno, María Del Prado
AB In this letter we reflect on the propagation of gravitational waves in alternative theories of gravity, which are typically formulated using extra gravitational degrees of freedom in comparison to General Relativity. We propose to understand that additional structure as forming a diagravitational medium for gravitational waves characterized by a refractive index. Furthermore, we shall argue that the most general diagravitational medium has associated an anisotropic dispersion relation. In some situations a refractive index tensor, which takes into account both the deflection of gravitational waves due to the curvature of a non-flat spacetime and the modifications of the general relativistic predictions, can be defined. The most general media, however, entail the consideration of at least two independent tensors.
PB Elsevier science BV
SN 0370-2693
YR 2019
FD 2019-01-10
LK https://hdl.handle.net/20.500.14352/13071
UL https://hdl.handle.net/20.500.14352/13071
LA eng
NO ©2018 The AuthorsWe thank J. M. Ezquiaga for useful comments. This work is supported by the project FIS2016-78859-P (AEI/FEDER, UE). PMM gratefully acknowledges financial support provided through the Research Award L'Oreal-UNESCO FWIS (XII Spanish edition).
NO Ministerio de Economía y Competitividad (MINECO)/FEDER
NO Research Award L'Oreal-UNESCO FWIS (XII Spanish edition)
DS Docta Complutense
RD 9 may 2025