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Emergence of a Cyclic Universe from the Hagedorn Soup · Around

2008

Emergence of a Cyclic Universe from the Hagedorn Soup

Biswas, Tirthabir

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One of the challenges of constructing a successful cyclic universe scenario is to be able to incorporate the second law of thermodynamics which typically leads to Tolman's problem of ever shrinking cycles.

In this paper we construct a non-singular toy model where as the cycles shrink in the past they also spend more and more time in the entropy conserving Hagedorn phase.
Thus in such a scenario the entropy asymptotes to a finite non-zero constant in the infinite past.
The universe ``emerges'' from a small (string size) geodesically complete quasi-periodic space-time.

Built on

R.C.Tolman, Relativity,Thermodynamics andCosmology,(OxfordU.Press,Clarendon Press,1934); “On the Problem of the Entropy of the Universe as a Whole”, Phys. Rev. 37
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H. Bondi and T. Gold, Mon. Not. Roy. Astron. Soc. 108
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1964
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N. Deo, S. Jain, O. Narayan and C. I. Tan, Phys. Rev. D 45
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R. H. Brandenberger and C. Vafa, Nucl. Phys. B 316
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1989
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Then

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