Gravitational Production of Dark Matter during Reheating. (arXiv:2102.06214v1 [hep-ph])

Gravitational Production of Dark Matter during Reheating. (arXiv:2102.06214v1 [hep-ph])
<a href="http://arxiv.org/find/hep-ph/1/au:+Mambrini_Y/0/1/0/all/0/1">Yann Mambrini</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Olive_K/0/1/0/all/0/1">Keith A. Olive</a>

We consider the direct $s$-channel gravitational production of dark matter
during the reheating process. Independent of the identity of the dark matter
candidate or its non-gravitational interactions, the gravitational process is
always present and provides a minimal production mechanism. During reheating, a
thermal bath is quickly generated with a maximum temperature $T_{rm max}$, and
the temperature decreases as the inflaton continues to decay until the energy
densities of radiation and inflaton oscillations are equal, at $T_{rm RH}$.
During these oscillations, $s$-channel gravitational production of dark matter
occurs. We show that the abundance of dark matter (fermionic or scalar) depends
primarily on the combination $T_{rm max}^4/T_{rm RH} M_P^3$. We find that a
sufficient density of dark matter can be produced over a wide range of dark
matter masses: from a GeV to a ZeV.

We consider the direct $s$-channel gravitational production of dark matter
during the reheating process. Independent of the identity of the dark matter
candidate or its non-gravitational interactions, the gravitational process is
always present and provides a minimal production mechanism. During reheating, a
thermal bath is quickly generated with a maximum temperature $T_{rm max}$, and
the temperature decreases as the inflaton continues to decay until the energy
densities of radiation and inflaton oscillations are equal, at $T_{rm RH}$.
During these oscillations, $s$-channel gravitational production of dark matter
occurs. We show that the abundance of dark matter (fermionic or scalar) depends
primarily on the combination $T_{rm max}^4/T_{rm RH} M_P^3$. We find that a
sufficient density of dark matter can be produced over a wide range of dark
matter masses: from a GeV to a ZeV.

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