Research output: Contribution to journal › Article › peer-review
Dark matter production and reheating via direct inflaton couplings: collective effects. / Lebedev, Oleg ; Smirnov, Fedor ; Solomko, Timofey ; Yoon, Jong-Hyun.
In: Journal of Cosmology and Astroparticle Physics, Vol. 2021, No. 10, 032, 12.10.2021.Research output: Contribution to journal › Article › peer-review
}
TY - JOUR
T1 - Dark matter production and reheating via direct inflaton couplings: collective effects
AU - Lebedev, Oleg
AU - Smirnov, Fedor
AU - Solomko, Timofey
AU - Yoon, Jong-Hyun
PY - 2021/10/12
Y1 - 2021/10/12
N2 - We study scalar dark matter production and reheating via renormalizable inflaton couplings, which include both quartic and trilinear interactions. These processes often depend crucially on collective effects such as resonances, backreaction and rescattering of the produced particles. To take them into account, we perform lattice simulations and map out parameter space producing the correct (non-thermal) dark matter density. We find that the inflaton-dark matter system can reach a quasi-equilibrium state during preheating already at very small couplings, in which case the dark matter abundance becomes independent of the inflaton-dark matter coupling and is described by a universal formula. Dark matter is readily overproduced and even tiny values of the direct inflaton couplings can be sufficient to get the right composition of the Universe, which reaffirms their importance in cosmology.
AB - We study scalar dark matter production and reheating via renormalizable inflaton couplings, which include both quartic and trilinear interactions. These processes often depend crucially on collective effects such as resonances, backreaction and rescattering of the produced particles. To take them into account, we perform lattice simulations and map out parameter space producing the correct (non-thermal) dark matter density. We find that the inflaton-dark matter system can reach a quasi-equilibrium state during preheating already at very small couplings, in which case the dark matter abundance becomes independent of the inflaton-dark matter coupling and is described by a universal formula. Dark matter is readily overproduced and even tiny values of the direct inflaton couplings can be sufficient to get the right composition of the Universe, which reaffirms their importance in cosmology.
KW - dark matter simulations
KW - dark matter theory
KW - physics of the early universe
KW - LATTICE
UR - http://www.scopus.com/inward/record.url?scp=85117699965&partnerID=8YFLogxK
UR - https://www.mendeley.com/catalogue/33483699-d82a-3e61-a51f-0704da984fe7/
U2 - 10.1088/1475-7516/2021/10/032
DO - 10.1088/1475-7516/2021/10/032
M3 - Article
VL - 2021
JO - Journal of Cosmology and Astroparticle Physics
JF - Journal of Cosmology and Astroparticle Physics
SN - 1475-7516
IS - 10
M1 - 032
ER -
ID: 86441833