Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1995-05-25
Physics
High Energy Physics
High Energy Physics - Theory
Lecture delivered at STRINGS '95, Future Perspectives in String Theory, USC, Los Angeles, march 13 - 18, 1995, 12 pages, LaTex
Scientific paper
This is a short review on strings in curved spacetimes. We start by recalling the classical and quantum string behaviour in singular plane waves backgrounds. We then report on the string behaviour in cosmological spacetimes (FRW, de Sitter, power inflation) which is by now largerly understood. Recent progress on self-consistent solutions to the Einstein equations for string dominated universes is reviewed. The energy-momentum tensor for a gas of strings is considered as source of the spacetime geometry. The string equation of state is determined from the behaviour of the explicit string solutions. This yields a self-consistent cosmological solution exhibiting realistic matter dominated behaviour $ R \sim (T)^{2/3}\; $ for large times and radiation dominated behaviour $ R \sim (T)^{1/2}\; $ for early times. Inflation in the string theory context is discussed.
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