Micro-Structure of Black Holes and String Theory

Abstract

Black holes are a subject of much interest in various areas of astro-physics and physics. There is little doubt among astronomers about black hole candidates in binary systems and there is also evidence that the matter of galaxies is belched in ‘active galactic nuclei’ which are black holes with a million times the solar mass. Why do black holes occur? The standard answer is gravitational collapse and the existence of black hole solutions in general relativity. The basic characteristic of a black hole within the framework of general relativity is that it has a curvature singularity where all the matter is supposed to have fallen in and that this singularity is ‘surrounded’ by an event horizon. This is a null surface that divides the space-time into two distinct regions and plays a fundamental role in the description of the properties of a black hole. The linear stability analysis for the Schwarzschild black hole is a significant contribution of Vishveshwara [1].