Author:
Lebedev Oleg,Solomko Timofey,Yoon Jong-Hyun
Abstract
Abstract
We study postinflationary scalar dark matter production via its non-minimal
coupling to gravity. During the inflaton oscillation epoch, dark matter is produced
resonantly for a sufficiently large non-minimal coupling ξ ≳ 5. We find that
backreaction on the curvature and rescattering effects typically become important for the
values of ξ above 30, which invalidate simple estimates of the production
efficiency. At large couplings, the dark matter yield becomes almost independent of
ξ, signifying approximate quasi-equilibrium in the inflaton-dark matter system.
Although the analysis gets complicated by the presence of apparent negative energy in the
Jordan frame, this behaviour can be regularized by introducing mild dark matter
self-interaction. Using lattice simulations, we delineate parameter space leading to the
correct dark matter relic abundance.
Subject
Astronomy and Astrophysics
Cited by
8 articles.
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