String Gravity and Cosmology: Some new ideas

Abstract

String theory provides the only consistent framework so far that unifies all interactions including gravity. We discuss gravity and cosmology in string theory. Conventional notions from general relativity like geometry, topology etc. are well defined only as low energy approximations in string theory. At small distances physics deviates from the field theoretic intuition. We present several examples of purely stringy phenomena which imply that the physics at strong curvatures can be quite different from what one might expect from field theory. They indicate new possibilities in the context of quantum cosmology.

To appear in the proceedings of the Four Seas Conference, Trieste, June 1995

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• Thermal duality and non-singular cosmology in d-dimensional superstrings
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• S-brane to thermal non-singular string cosmology
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• Non-singular string cosmology in a 2d Hybrid model
• Marginal Deformations of Vacua with Massive boson-fermion Degeneracy Symmetry
• Orbifold Symmetry Reductions of Massive Boson-Fermion Degeneracy
• A Wave-function for Stringy Universes
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