Title: Black holes, Regular Made by General Relativity

Speaker: Prof. Ding-Fang Zeng (Beijing University of Technology)

Time: 10:00AM, June 20th，2016 (Monday)

Place: Theoretical Physics Division，319

Abstract: What's inside black holes? Is it a bridge to totally different new worlds, or some exotic phases of matter featured by conventional quantum mechanics or just a mass point covered by event horizon? All these reflections follow exact rules of logic and usually take precise solutions to the Einstein equation such as Schwarzschild one as basis are thus hardly to be wrong. However, by taking a collapsing star consisting of pressureless dust fluid instead of test particles in the pre-existing black hole background as a studying object, this paper, for the first time, derives out exact equations controlling the evolution of the collapsing star, uncovers numerically that in such a star, horizons can be finished forming in finite durations, but central singularities can not be. Wrapping the central point is an eternally contracting inner horizon, around which all information featuring the parent star is stored and can be calculated exactly.