Description
The discovery of the gravitational production channel reveals the fact
that in any dark matter(DM) phenomenology, such a gravitational contribution
happens to be inescapable. In this work, we consider a novel gravity-mediated,
non-perturbative production channel, unveiling its potential implications in DM
phenomenology. The framework is the well-known gravitational particle production
in a time-dependent background. Inflation plays an instrumental role in this regard.
The inflationary epoch is well-known to be an ideal laboratory for gravitational
particle production. One of its most profound consequences is the late-time
structure formation, which can be traced back to the infrared fluctuations of the
inflaton field—interpretable as very low energy quantum inflaton particles produced
by the inflationary background. Due to its very gravitational nature, such production
of infrared fluctuation applies to any quantum field, such as DM, which is our
present topic of discussion. In this work, we indeed demonstrate that such
inescapable and universal gravitational production significantly alters the DM
phenomenology.
