Studies of Formation and Evolution of Compact Objects in the Universe

Abstract

newline Quite recently, black holes have become important in astrophysics, cosmology and newlinein the study of quantum gravity. Although, they were speculated theoretically newlinelong back, they have been directly detected through experiments, only few years newlineback, through gravitational waves. The main properties of black hole spacetimes newlineare obtained from the study of its horizon. It is quite well known that the concept newlineof event horizon is not very useful since it suffers from teleological problems and newlinehence, cannot describe physical systems like black hole horizons satisfactorily. newlineQuasilocal formulations have become quite important since they are seen as an newlinealternate description which is useful to study classical and quantum properties newlineof black hole horizons. In this thesis, we have argued that the formulation of newlinemarginally trapped tubes (MTT) can be used to study black hole horizons. Using newlineseveral profiles of collapsing matter we have argued that MTTs are indeed ideal newlinerepresentations of black hole horizons in general relativity and in Einstein- Gauss- newlineBonnet theory.