Producing a Scale-Invariant Spectrum of Perturbations in a Hagedorn Phase of String Cosmology

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Ali Nayeri,¹ Robert H. Brandenberger,² and Cumrun Vafa¹
¹Jefferson Physical Laboratory, Harvard University, Cambridge, Massachusetts 02138, USA
²Department of Physics, McGill University, 3600 University Street, Montréal QC, H3A 2T8, Canada

Received 21 February 2006; published 14 July 2006

Westudy the generation of cosmological perturbations during the Hagedorn phaseof string gas cosmology. Using tools of string thermodynamics weprovide indications that it may be possible to obtain anearly scale-invariant spectrum of cosmological fluctuations on scales which areof cosmological interest today. In our cosmological scenario, the earlyHagedorn phase of string gas cosmology goes over smoothly intothe radiation-dominated phase of standard cosmology, without having a periodof cosmological inflation.

URL:	http://link.aps.org/doi/10.1103/PhysRevLett.97.021302
DOI:	10.1103/PhysRevLett.97.021302
PACS:	98.80.Cq 98.80.Cq Particle-theory and field-theory models of the early Universe (including cosmic pancakes, cosmic strings, chaotic phenomena, inflationary universe, etc.) YEAR: 2006

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