String Gas Cosmology and Structure Formation - A Brief Review
High Energy Physics - Theory
2008-11-26 v1 Astrophysics
General Relativity and Quantum Cosmology
High Energy Physics - Phenomenology
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.
Cite
@article{arxiv.hep-th/0702001,
title = {String Gas Cosmology and Structure Formation - A Brief Review},
author = {Robert Brandenberger},
journal= {arXiv preprint arXiv:hep-th/0702001},
year = {2008}
}
Comments
Invited talk at CosPA 2006, Nov. 15 - 17, 2006, National Taiwan University, Taipei, to be publ. in the proceedings, 11 pages, 3 figures