Superstring cosmology

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Abstract
Some cosmological consequences of the assumption that superstrings are more fundamental objects than ordinary local quantum fields are examined. We study, in particular, the dependence of both the string tension and the temperature of the primordial string soup on cosmic time. A particular scenario is proposed in which the universe undergoes a contracting ‘‘string phase’’ before the ordinary ‘‘big bang,’’ which according to this picture is nothing but the outcome of the transition from nonlocal to local fundamental physics.

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