Non-perturbative Gravity, Hagedorn Bounce & CMB

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dc.creatorBiswas, Tirthabir
dc.creatorBrandenberger, Robert
dc.creatorMazumdar, Anupam
dc.creatorSiegel, Warren
dc.date2006-10-25
dc.date.accessioned2026-07-07T11:28:06Z
dc.date.available2026-07-07T11:28:06Z
dc.descriptionIn hep-th/0508194 it was shown how non-perturbative corrections to gravity can resolve the big bang singularity, leading to a bouncing universe. Depending on the scale of the non-perturbative corrections, the temperature at the bounce may be close to or higher than the Hagedorn temperature. If matter is made up of strings, then massive string states will be excited near the bounce, and the bounce will occur inside (or at the onset of) the Hagedorn phase for string matter. As we discuss in this paper, in this case cosmological fluctuations can be generated via the string gas mechanism recently proposed in hep-th/0511140. In fact, the model discussed here demonstrates explicitly that it is possible to realize the assumptions made in hep-th/0511140 in the context of a concrete set of dynamical background equations. We also calculate the spectral tilt of thermodynamic stringy fluctuations generated in the Hagedorn regime in this bouncing universe scenario. Generally we find a scale-invariant spectrum with a red tilt which is very small but does not vanish.
dc.description25 pages, 1 figure
dc.identifierhttps://arxiv.org/abs/hep-th/0610274
dc.identifierhttp://arxiv.org/abs/hep-th/0610274
dc.identifierJCAP0712:011,2007
dc.identifierdoi:10.1088/1475-7516/2007/12/011
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/196336
dc.subjectHigh Energy Physics - Theory
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Phenomenology
dc.titleNon-perturbative Gravity, Hagedorn Bounce & CMB
dc.typetext

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