Large Radius Hagedorn Regime in String Gas Cosmology

Skliros, Dimitri P and Hindmarsh, Mark B (2008) Large Radius Hagedorn Regime in String Gas Cosmology. Physical Review D, 78 (6). 063539. ISSN 1550-7998

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We calculate the equation of state of a gas of strings at high density in a large toroidal universe and use it to determine the cosmological evolution of background metric and dilaton fields in the entire large radius Hagedorn regime, (ln¿S)1/d«R«S1/d (with S the total entropy). The pressure in this regime is not vanishing but of O(1), while the equation of state is proportional to volume, which makes our solutions significantly different from previously published approximate solutions. For example, we are able to calculate the duration of the high-density Hagedorn phase, which increases exponentially with increasing entropy, S. We go on to discuss the difficulties of the scenario, quantifying the problems of establishing thermal equilibrium and producing a large but not too weakly coupled universe.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Depositing User: Dimitri Skliros
Date Deposited: 06 Feb 2012 21:22
Last Modified: 03 Jul 2019 00:21

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