Non-Gaussianity from isocurvature perturbations

Details Non-Gaussianity from isocurvature perturbations Non-Gaussianity from isocurvature perturbations

2008-07-31

arxiv.org/abs/0808.0009v3

JCAP0811:019,2008

Astronomy and Astrophysics

Astrophysics

24 pages, 6 figures; references added; version to appear in JCAP

Scientific paper

10.1088/1475-7516/2008/11/019

We develop a formalism to study non-Gaussianity in both curvature and isocurvature perturbations. It is shown that non-Gaussianity in the isocurvature perturbation between dark matter and photons leaves distinct signatures in the CMB temperature fluctuations, which may be confirmed in future experiments, or possibly, even in the currently available observational data. As an explicit example, we consider the QCD axion and show that it can actually induce sizable non-Gaussianity for the inflationary scale, H_{inf} = O(10^9 - 10^{11})GeV.

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