Modulated curvaton decay

Hooshyar Assadullahi, Hassan Firouzjahi, Mohammad Hossein Namjoo, David Wands

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We study primordial density perturbations generated by the late decay of a curvaton field whose decay rate may be modulated by the local value of another isocurvature field, analogous to models of modulated reheating at the end of inflation. We calculate the primordial density perturbation and its local-type non-Gaussianity using the sudden-decay approximation for the curvaton field, recovering standard curvaton and modulated reheating results as limiting cases. We verify the Suyama-Yamaguchi inequality between bispectrum and trispectrum parameters for the primordial density field generated by multiple field fluctuations, and find conditions for the bound to be saturated.
Original languageEnglish
Pages (from-to)041
JournalJournal of Cosmology and Astroparticle Physics
Issue number3
Publication statusPublished - Mar 2013


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