String Gas Cosmology and Structure Formation -a Brief Review *

  title={String Gas Cosmology and Structure Formation -a Brief Review *},
  author={Robert H. Brandenberger},
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… CONTINUE READING

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