Absence of initial singularities in superstring cosmology

Details Absence of initial singularities in superstring cosmology Absence of initial singularities in superstring cosmology

1997-08-10

arxiv.org/abs/gr-qc/9708018v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

20 pages, revtex, including 2 PostScript figures appended using epsf. Based on talk given at the Conference on Big Bang and Al

Scientific paper

10.1007/BF02709328

In a universe whose elementary constituents are point particles there does not seem to be any obvious mechanism for avoiding the initial singularities in physical quantities in the standard model of cosmology. In contrast in string theory these singularities can be absent even at the level where spacetime is treated classically. This is a consequence of the basic degrees of freedom of strings in compact spaces, which necessitate a reinterpretation of what one means by a very small universe. We discuss the basic degrees of freedom of a string at the classical and quantum level, the minimum size of strings (string uncertainty principle), the t-duality symmetry, and string thermodynamics at high energy densities, and then describe how these considerations suggest a resolution of the initial singularity problem. An effort has been made to keep this writeup self-contained and accessible to non-string theorists.

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