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Non-Gaussianity from isocurvature perturbations

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arxiv 0808.0009 v3 pith:35E6HGRB submitted 2008-07-31 astro-ph gr-qchep-phhep-th

Masahiro Kawasaki , Kazunori Nakayama , Toyokazu Sekiguchi , Teruaki Suyama , Fuminobu Takahashi This is my paper · ORCID
classification astro-phgr-qchep-phhep-th
keywords non-gaussianityisocurvatureperturbationsactuallyavailableaxionconfirmedconsider
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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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  1. Axion Perturbations: A General Analytical Treatment

    hep-ph 2025-10 conditional novelty 5.0 of 10

    Axion dark-matter perturbations are determined entirely by the homogeneous axion background's dependence on its initial misalignment angle, plus Weinberg's universal adiabatic-mode term.

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