https://doi.org/10.1140/epjc/s10052-017-4936-0
Regular Article - Theoretical Physics
Scattering of Ricci scalar perturbations from Schwarzschild black holes in modified gravity
1
Astrophysics and Cosmology Research Unit, School of Mathematics Statistics and Computer Science, University of KwaZulu-Natal, Private Bag X54001, Durban, 4000, South Africa
2
Department of Mathematics and Applied Mathematics and ACGC, University of Cape Town, Cape Town, 7701, South Africa
* e-mail: Goswami@ukzn.ac.za
Received:
27
January
2017
Accepted:
23
May
2017
Published online:
31
May
2017
It has already been shown that the gravitational waves emitted from a Schwarzschild black hole in f(R) gravity have no signatures of the modification of gravity from General Relativity, as the Regge–Wheeler equation remains invariant. In this paper we consider the perturbations of Ricci scalar in a vacuum Schwarzschild spacetime, which is unique to higher order theories of gravity and is absent in General Relativity. We show that the equation that governs these perturbations can be reduced to a Volterra integral equation. We explicitly calculate the reflection coefficients for the Ricci scalar perturbations, when they are scattered by the black hole potential barrier. Our analysis shows that a larger fraction of these Ricci scalar waves are reflected compared to the gravitational waves. This may provide a novel observational signature for fourth order gravity.
© The Author(s), 2017
