Scattering of Ricci scalar perturbations from Schwarzschild black holes in modified gravity
Abstract
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 ReggeWheeler 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.
 Publication:

European Physical Journal C
 Pub Date:
 June 2017
 DOI:
 10.1140/epjc/s1005201749360
 arXiv:
 arXiv:1611.06043
 Bibcode:
 2017EPJC...77..364S
 Keywords:

 General Relativity and Quantum Cosmology;
 Astrophysics  High Energy Astrophysical Phenomena;
 High Energy Physics  Theory
 EPrint:
 14 pages, 2 figures. minor changes, references added