Date: 
April 9, 2008, from 15:30 
Place: 
Room 633, 6th floor, Research Centers Building, Kashiwa Campus of the University of Tokyo. 
Speaker: 
Simeon Hellerman (IAS) 
Title: 
Cosmological Unification of String Theories 
Abstract: 
In this talk I will describe developments in our understanding of quantum gravity in highly nonsupersymmetric phases.
These developments are based on the recent discovery of exact solutions of string theory describing dynamical transitions between string theories of radically different character.
Relative to the initial state, the final state of the transition can have a different number of dimensions or topology, reduced worldsheet supersymmetry, or restored spacetime supersymmetry.
All solutions are exact in the string scale and occur at arbitrarily weak coupling.
Together, these solutions describe a vast superlandsape that unites all known string theories into a single connected configuration space.
