Talks

In this talk I will present a set of exact cosmological solutions to string theory which describe dynamical transitions between vacua with different numbers of spacetime dimensions, different degrees of stability, and different amounts of spacetime and worldsheet supersymmetry. These solutions fill out a picture of an extended duality web in which nonsupersymmetric string theories, bosonic string theory, and string theory in D=2 and D>10 are connected via dynamical transitions to the well-known supersymmetric moduli space of ten-dimensional superstring theory.