Thermally induced perturbations in inflation

Details Thermally induced perturbations in inflation Thermally induced perturbations in inflation

2011-10-06

arxiv.org/abs/1110.1172v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Revtex4 file, 3 pages

Scientific paper

In some versions of the theory of inflation, it is assumed that before inflation began the universe was in a Friedmann-Robertson-Walker (FRW) stage, with the energy density dominated by massless particles. The origin of the nearly scale-invariant density perturbations is supposed to be quantum fluctuations in the inflaton field. Here we point out that under those conditions there would necessarily also be large thermally induced density perturbations. It is commonly asserted that inflation would smooth out any pre-existing perturbations. But that argument relies on linear perturbation theory, which would be rendered invalid. Under those circumstances there is no reason to believe that inflation would have the desired smoothing effect. Even without a prior FRW phase, there could be problems because of the Gibbons-Hawking temperature of de Sitter space.

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