Cosmological perturbations from statistical thermal fluctuations
  Cosmological perturbations due to statistical thermal fluctuations in a
single fluid characterized by an arbitrary equation of state are computed.
Formulas to predict the scalar and tensor perturbation spectra and
nongaussianity parameters at a given temperature are derived. These results are
relevant to any cosmological scenario where cosmic structures may have been
seeded thermally instead of originating purely from quantum vacuum
fluctuations.
