%0 Journal Article
%T Characterizing the postinflationary reheating history: Single daughter field with quadratic-quadratic interaction
%A Antusch, S.
%A Figueroa, D. G.
%A Marschall, K.
%A Torrenti, F.
%J Physical Review D
%D 2022
%V 105
%N 4
%I Amer Physical Soc
%@ 2470-0010
%G English
%F Antusch_etal2022
%O WOS:000767129500008
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=5173), last updated on Mon, 28 Mar 2022 07:09:57 +0000
%X We study the evolution of the energy distribution and equation of state of the Universe from the end of inflation until the onset of either radiation domination (RD) or a transient period of matter domination (MD). We use both analytical techniques and lattice simulations. We consider two-field models where the inflaton (/) has a monomial potential after inflation V((/)) proportional to i(/) – vip (p 4, and of order similar to 50% for p 4. The system goes to MD at late times for p = 2, while it goes to RD for p > 2. In the later case, we can calculate exactly the number of e-folds until RD as a function of g2, and hence predict accurately inflationary observables like the scalar tilt ns and the tensor-to-scalar ratio r. In the scenario (ii), the energy is always transferred completely to X for p > 2, as long as its effective mass m2X = g2((/) – v)2 is not negligible. For p = 2, the final ratio between the energy densities of X and (/) depends strongly on g2. For all p > 2, the system always goes to MD at late times.
%R 10.1103/PhysRevD.105.043532
%U https://arxiv.org/abs/2112.11280
%U https://doi.org/10.1103/PhysRevD.105.043532
%P 043532-36pp