Non-Gaussianity after many-field reheating

Pedro Carrilho , David Mulryne , John Ronayne (1)

1 IAP - Institut d'Astrophysique de Paris

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.

Mots clés: Cosmology; non-Gaussianity; reheating; boundary condition; decay rate; inflation

Domaines: Astrophysique [astro-ph]

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