String gas cosmology and structure formation

By Robert Brandenberger, A. Nayeri, S. Patil, C. Vafa. 2006

168 citations recorded by the source corpus.

It has recently been shown that a Hagedorn phase of string gas cosmology may provide a causal mechanism for generating a nearly scale-invariant spectrum of scalar metric fluctuations, without the need for an intervening period of de Sitter expansion. A distinctive signature of this structure formation scenario would be a slight blue tilt of the spectrum of gravitational waves. In this paper we give more details of the computations leading to these results, and the assumptions underlying them.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/c0cc882f66d6c7f03b793b045fdde4c5a2f5efe9

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Citations in the corpus

Nonsingular cosmology with a scale-invariant spectrum of cosmological perturbations from Lee-Wick theory (2008, methodology): “As was done in the case of string gas cosmology [44, 45] (see [46] for a recent comprehensive review), we follow the matter perturbations up to Hubble radius crossing and then convert to metric fluctuations by making use of the perturbed Einstein constraint equation (the time-time component of the p”
Trans-Planckian issues for inflationary cosmology (2012, background): “The first is the string gas cosmology model introduced as a background cosmology in [57] (see also [58]) and shown to lead to a mechanism for producing an almost scale-invariant spectrum of cosmological perturbations in [59, 60].”
Chern-Simons Modified General Relativity (2009, background): “In fact, there are other models that suggest the CS correction could be enhanced, due to non-perturbative instanton corrections [5], interactions with fermions [6], large intrinsic curvatures [7] or small string couplings at late times [8,9,10,11,12,13,14,15,16,17].”
Bouncing Cosmologies: Progress and Problems (2016, methodology): “[24] for an elaboration on this point), measuring a slight red tilt would be a rather distinctive prediction since it would allow us to rule out some alternatives such as string gas cosmology which predicts a slightly blue spectrum [25].”
New physics from the polarized light of the cosmic microwave background (2022, background): “Additional scalar degrees of freedom during inflation 207–211 and other scenarios 212–214 can enhance the amplitude of GW.”