Gravitational Collapse in the EGB Gravity

TL;DR

This paper investigates gravitational collapse in five-dimensional Einstein-Gauss-Bonnet gravity, analyzing how initial matter profiles and the GB coupling influence black hole horizon formation, with comparisons to Einstein's theory.

Contribution

It provides a detailed analysis of marginally trapped surfaces and black hole horizon evolution in 5D EGB gravity, highlighting the effects of initial conditions and GB coupling.

Findings

Horizon location depends on initial density and velocity profiles.

Black hole formation is significantly affected by the Gauss-Bonnet coupling.

Comparison shows differences from Einstein's gravity results.

Abstract

The Einstein- Gauss- Bonnet (EGB) gravity is an important modification of the Einstein theory of gravity and, for many gravitational phenomena, the Gauss- Bonnet (GB) correction term leads to drastic differences. In this paper, we study gravitational collapse in the $5$-dimensional EGB theory. We construct the spherical marginally trapped surfaces and determine the evolution of marginally trapped surfaces when the infalling matter admits a wide variety of initial density distribution. We show that the location of black hole horizon depends crucially on the initial density and velocity profile of the inflating matter as well as on the GB coupling constant. A detailed comparison is made with the results of Einstein's theory.