Eur. Phys. J. C (2018) 78: 316
https://doi.org/10.1140/epjc/s10052-018-5800-6

Regular Article - Theoretical Physics

Greybody factor of a scalar field from Reissner–Nordström–de Sitter black hole

¹ Department of Mathematics, Quaid-i-Azam University, Islamabad, Pakistan
² Center for the Fundamental Laws of Nature, Harvard University, Cambridge, MA, 02138, USA

^* e-mail: ksaifullah@fas.harvard.edu

Received: 3 April 2018
Accepted: 7 April 2018
Published online: 19 April 2018

Abstract

In this work we derive a general expression for the greybody factor of non-minimally coupled scalar fields in Reissner–Nordström–de Sitter spacetime in low frequency approximation. Greybody factor as a characteristic of effective potential barrier, will be presented. We discuss the role of cosmological constant both, in the absence as well as in the presence of non-minimal coupling. Considering non-minimal coupling as a mass term, its effect on the greybody factor will be discussed. We also elaborate the significance of the results by giving formulae of differential energy rate and general absorption cross section. The greybody factor gives insight into the spectrum of Hawking radiations.