Dark Matter Production during the Thermalization Era. (arXiv:1901.11027v1 [hep-ph])
<a href="http://arxiv.org/find/hep-ph/1/au:+Harigaya_K/0/1/0/all/0/1">Keisuke Harigaya</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Mukaida_K/0/1/0/all/0/1">Kyohei Mukaida</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Yamada_M/0/1/0/all/0/1">Masaki Yamada</a>
We revisit the non-thermal dark matter (DM) production during the
thermalization and reheating era after inflation. The decay of inflaton
produces high-energy particles that are thermalized to complete the reheating
of the Universe. Before the thermalization is completed, DM can be produced
from a collision between the high-energy particles and/or the ambient plasma.
We calculate the DM abundance produced from these processes for the case where
the cross section of the DM production is proportional to the $n$-th power of
the center of mass energy. We find that the collision between the high-energy
particles is almost always dominant for $n gtrsim 4$ while it is subdominant
for $n lesssim 2$. The production from the ambient plasma is dominant when $n
lesssim 3$ and the reheating temperature is of the order of or larger than the
DM mass. The production from a collision between the high-energy particle and
the ambient plasma is important for $n lesssim 2$ and the reheating
temperature is much lower than the DM mass.
We revisit the non-thermal dark matter (DM) production during the
thermalization and reheating era after inflation. The decay of inflaton
produces high-energy particles that are thermalized to complete the reheating
of the Universe. Before the thermalization is completed, DM can be produced
from a collision between the high-energy particles and/or the ambient plasma.
We calculate the DM abundance produced from these processes for the case where
the cross section of the DM production is proportional to the $n$-th power of
the center of mass energy. We find that the collision between the high-energy
particles is almost always dominant for $n gtrsim 4$ while it is subdominant
for $n lesssim 2$. The production from the ambient plasma is dominant when $n
lesssim 3$ and the reheating temperature is of the order of or larger than the
DM mass. The production from a collision between the high-energy particle and
the ambient plasma is important for $n lesssim 2$ and the reheating
temperature is much lower than the DM mass.
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