New mechanism of producing superheavy Dark Matter. (arXiv:1812.03516v1 [hep-ph])
<a href="http://arxiv.org/find/hep-ph/1/au:+Babichev_E/0/1/0/all/0/1">Eugeny Babichev</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Gorbunov_D/0/1/0/all/0/1">Dmitry Gorbunov</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Ramazanov_S/0/1/0/all/0/1">Sabir Ramazanov</a>
We study in detail the recently proposed mechanism of generating superheavy
Dark Matter with the mass larger than the Hubble rate at the end of inflation.
A real scalar field constituting Dark Matter linearly couples to the inflaton.
As a result of this interaction, during inflation the scalar is displaced from
its zero expectation value. This offset feeds into the energy density of Dark
Matter at later stages. This mechanism is universal and can be implemented in a
generic inflationary model. Compared to the other known mechanisms of
superheavy particles production, our scenario does not imply an upper bound on
the scalar field masses. Phenomenology of the model is comprised of Dark Matter
decay into inflatons, which in turn decay into Standard Model species
triggering cascades of high energy particles contributing to the cosmic ray
flux. We evaluate the lifetime of Dark Matter and obtain limits on the
inflationary scenarios, where this mechanism does not lead to the conflict with
the Dark Matter stability considerations/studies of cosmic ray propagation.
We study in detail the recently proposed mechanism of generating superheavy
Dark Matter with the mass larger than the Hubble rate at the end of inflation.
A real scalar field constituting Dark Matter linearly couples to the inflaton.
As a result of this interaction, during inflation the scalar is displaced from
its zero expectation value. This offset feeds into the energy density of Dark
Matter at later stages. This mechanism is universal and can be implemented in a
generic inflationary model. Compared to the other known mechanisms of
superheavy particles production, our scenario does not imply an upper bound on
the scalar field masses. Phenomenology of the model is comprised of Dark Matter
decay into inflatons, which in turn decay into Standard Model species
triggering cascades of high energy particles contributing to the cosmic ray
flux. We evaluate the lifetime of Dark Matter and obtain limits on the
inflationary scenarios, where this mechanism does not lead to the conflict with
the Dark Matter stability considerations/studies of cosmic ray propagation.
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