Absorption and Scattering Cross Section of Regular Black Holes

Hai Huang,Ping Liao,Yongjiu Wang,Juhua Chen

doi:10.1155/2014/231727

Abstract

By using the partial wave method, we investigate the absorption of massless scalar wave from regular black hole. We numerically carry out the absorption cross section and find that the larger angular momentum quantum number l is, the smaller the corresponding maximum value of partial absorption cross section is. Comparing with Schwarzschild case, the absorption cross section of regular black holes is strengthened in both low and high frequency regions, and the absorption cross section oscillates around the geometric optical value in the high frequency region. Generally speaking, the scattering flux is strengthened and its scattering width becomes narrower in the forward direction. There are obvious contrast of scattering properties of different type of regular black hole.

Highlights

Over the last four decades, the physics of particle scattering from different kinds of black holes was one of the most active topics of strong gravitational fields
We mainly focus on the scalar scattering process of regular black holes and how black hole interacting with Journal of Gravity the nonlinear electrodynamics affect scalar absorption and scattering
Compared to Schwarzschild case, we find these characteristics: type (2) scattering flux is strengthened and its width becomes narrower in the forward direction

Summary

Introduction

Over the last four decades, the physics of particle scattering from different kinds of black holes was one of the most active topics of strong gravitational fields. The study of absorption of waves and particles by black holes and by analogous higher-dimensional objects has received considerable attention, because this topic is directly relevant to numerous fundamental aspects of classical and quantum black hole physics which could permit us to progress in our understanding of spacetime properties (see, e.g., [1,2,3,4,5,6,7,8,9,10,11,12] and the references therein). The solution was obtained by introducing an energy momentum tensor, regular and bounded, decaying at infinity, and satisfying the weak energy conditions It can be interpreted as the gravitational field of some sort of nonlinear magnetic monopole [17].

The Partial Wave Method

Absorption Cross Sections

Scattering Cross Section

Conclusions