Strings in a Time-Dependent Orbifold

Details Strings in a Time-Dependent Orbifold Strings in a Time-Dependent Orbifold

2002-04-19

arxiv.org/abs/hep-th/0204168v3

JHEP 0206:045,2002

Physics

High Energy Physics

High Energy Physics - Theory

27 pages, minor changes and note added

Scientific paper

10.1088/1126-6708/2002/06/045

We consider string theory in a time dependent orbifold with a null singularity. The singularity separates a contracting universe from an expanding universe, thus constituting a big crunch followed by a big bang. We quantize the theory both in light-cone gauge and covariantly. We also compute some tree and one loop amplitudes which exhibit interesting behavior near the singularity. Our results are compatible with the possibility that strings can pass through the singularity from the contracting to the expanding universe, but they also indicate the need for further study of certain divergent scattering amplitudes.

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