String Gas Cosmology and Structure Formation - A Brief Review

Abstract

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.

Invited talk at CosPA 2006, Nov. 15 - 17, 2006, National Taiwan University, Taipei, to be publ. in the proceedings, 11 pages, 3 figures

References in corpus (4)

• The Emergent Universe: inflationary cosmology with no singularity
• Elements of String Cosmology
• Eternal inflation and the initial singularity
• Loitering Phase in Brane Gas Cosmology

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• Stabilizing moduli with thermal matter and nonperturbative effects
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• Emergent Cosmology from Quantum Gravity in the Lorentzian Barrett-Crane Tensorial Group Field Theory Model
• A new mechanism for non-locality from string theory: UV-IR quantum entanglement and its imprints on the CMB
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• Dilaton stabilization by massive fermion matter
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• Hamilton-Jacobi formalism for string gas thermodynamics