Hawking radiation for scalar fields by Einstein-Gauss-Bonnet–de Sitter black holes

Abstract

We study the greybody factor and power spectra of Hawking radiation for the minimally or nonminimally coupled scalar field with exact numerical method in spherically symmetric Einstein-Gauss-Bonnet-de Sitter black hole spacetime. The effects of scalar coupling constant, angular momentum number of scalar, spacetime dimension, cosmological constant and Gauss-Bonnet coupling constant on the Hawking radiation are studied in detail. Specifically, the Gauss-Bonnet coupling constant always increases the greybody factor in the entire energy regime.Different from the case of Schwarzschild-de Sitter black hole, the effects of the scalar coupling constant on the greybody factor are not monotonic but relevant to the values of Gauss-Bonnet coupling constant. Moreover, both these two coupling constants always suppress the power spectra of Hawking radiation in the whole energy regime. *

Superradiance and stability of the regularized 4D charged Einstein-Gauss-Bonnet black hole

“…However, the radial equation is hard to solve analytically in general. Most of the analytical studies were done with some approximation such as the frequency tends to zero or the black hole is very small [7,[58][59][60][61][62][63]. In this paper, we solve the radial equations numerically to study the whole parameter region.…”