Status of String Cosmology: Phenomenological Aspects

Details Status of String Cosmology: Phenomenological Aspects Status of String Cosmology: Phenomenological Aspects

1995-09-23

arxiv.org/abs/hep-th/9509127v1

Physics

High Energy Physics

High Energy Physics - Theory

37 pages, Plain TEX, 3 figures available by fax upon request, to appear in Proc. of the Erice School on "String gravity and ph

Scientific paper

I report recent studies on the evolution of perturbations in the context of the ``pre-big-bang" scenario typical of string cosmology, with emphasis on the formation of a stochastic background of relic photons and gravitons, and its possible direct/indirect observable consequences. I also discuss the possible generation of a thermal microwave background by using, as example, a simple gravi-axio-dilaton model whose classical evolution connects smoothly inflationary expansion to decelerated contraction. By including the quantum back-reaction of the produced radiation the model eventually approaches the standard radiation-dominated (constant dilaton) regime.

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