TY  - JOUR
AU  - Antusch, S.
AU  - Figueroa, D. G.
AU  - Marschall, K.
AU  - Torrenti, F.
PY  - 2022
DA  - 2022//
TI  - Characterizing the postinflationary reheating history: Single daughter field with quadratic-quadratic interaction
T2  - Phys. Rev. D
JO  - Physical Review D
SP  - 043532
EP  - 36pp
VL  - 105
IS  - 4
PB  - Amer Physical Soc
AB  - 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.
SN  - 2470-0010
UR  - https://arxiv.org/abs/2112.11280
UR  - https://doi.org/10.1103/PhysRevD.105.043532
DO  - 10.1103/PhysRevD.105.043532
LA  - English
N1  - WOS:000767129500008
ID  - Antusch_etal2022
ER  -