Thermal and quantum superstring cosmologies

Abstract

We consider four dimensional heterotic string backgrounds for which supersymmetry is spontaneously broken via the Scherk-Schwarz mechanism on an internal spatial cycle and by finite temperature effects. We concentrate on initially flat backgrounds with N=4 and N=2 amount of supersymmetry. Thermal and quantum corrections give rise to a non-trivial cosmological evolution. We show that these corrections are under control and calculable due to the underlying no-scale structure of the effective supergravity theory. The effective Friedmann-Hubble equation involves a radiation term ~1/a^4 and a curvature term ~1/a^2, whose coefficients are functions of ratio of the gravitino mass scale to the temperature.

12+1 pages

References in corpus (2)

• From Big Bang to Big Crunch and Beyond
• A Wave-function for Stringy Universes

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• Orbifold Symmetry Reductions of Massive Boson-Fermion Degeneracy
• Superstring cosmology for N_4 = 1 -> 0 superstring vacua
• Cosmological Perturbations Across an S-brane
• Attractions to radiation-like eras in superstring cosmologies
• Introduction to Superstring Cosmology