String Gas Cosmology and Structure Formation - A Brief Review

Details String Gas Cosmology and Structure Formation - A Brief Review String Gas Cosmology and Structure Formation - A Brief Review

2007-01-31

arxiv.org/abs/hep-th/0702001v1

Mod.Phys.Lett.A22:1875-1885,2007

Physics

High Energy Physics

High Energy Physics - Theory

Invited talk at CosPA 2006, Nov. 15 - 17, 2006, National Taiwan University, Taipei, to be publ. in the proceedings, 11 pages,

Scientific paper

10.1142/S0217732307025091

For suitable cosmological backgrounds, thermal fluctuations of a gas of strings can generate a scale-invariant spectrum of cosmological fluctuations without requiring a phase of inflationary expansion. We highlight the key points of this mechanism, and discuss cosmological backgrounds in which this scenario can be realized. The spectrum of cosmological perturbations has a small red tilt (like in scalar field-driven inflation) but (unlike in inflation) there is a small blue tilt of the spectrum of gravitational waves.

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