Schedule Feb 19, 2003
The Challenging Cosmological Singularity
Dr. Hong Liu, Rutgers
In this talk we will describe recent efforts in understanding cosmic singularities in string theory. We will start by motivating the need of going beyond general relativity in studying singularities, and review a few static examples in which they are successfully understood in string theory. We will then study in classical string theory a toy model with a Big Bang type of singularity. We will show that classical string theory is not sufficient to resolve this singularity, and therefore a better understanding of the full quantum theory will be needed. Lessons of the results and implications to some recently proposed cosmological scenarios will be discussed.

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