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Non-Gaussianity after many-field reheating

Abstract : We numerically investigate reheating after quadratic inflation with up to 65 fields, focusing on the production of non-Gaussianity. We consider several sets of initial conditions, masses, and decay rates. As expected, we find that the reheating phase can have a significant effect on the non-Gaussian signal, but that for this number of fields a detectable level of non-Gaussianity requires the initial conditions, mass range, and decay rates to be ordered in a particular way. We speculate on whether this might change in the N-flation limit.
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https://hal.archives-ouvertes.fr/hal-02973171
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Submitted on : Friday, August 12, 2022 - 12:20:05 PM
Last modification on : Friday, August 12, 2022 - 12:20:06 PM

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PhysRevD.103.083532.pdf
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Pedro Carrilho, David Mulryne, John Ronayne. Non-Gaussianity after many-field reheating. Physical Review D, American Physical Society, 2021, 103 (8), pp.083532. ⟨10.1103/PhysRevD.103.083532⟩. ⟨hal-02973171⟩

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