Dark matter seeping through dynamic gauge kinetic mixing. (arXiv:1905.11407v1 [hep-ph])
<a href="http://arxiv.org/find/hep-ph/1/au:+Banerjee_A/0/1/0/all/0/1">Avik Banerjee</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Bhattacharyya_G/0/1/0/all/0/1">Gautam Bhattacharyya</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Chowdhury_D/0/1/0/all/0/1">Debtosh Chowdhury</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Mambrini_Y/0/1/0/all/0/1">Yann Mambrini</a>
We show for the first time that the loop-driven kinetic mixing between
visible and dark Abelian gauge bosons can facilitate dark matter production in
the early Universe by creating a ‘dynamic’ portal, which depends on the energy
of the process. The required smallness of the strength of the portal
interaction, suited for freeze-in, is justified by a suppression arising from
the mass of a heavy vector-like fermion. The strong temperature sensitivity
associated with the interaction is responsible for most of the dark matter
production during the early stages of reheating.
We show for the first time that the loop-driven kinetic mixing between
visible and dark Abelian gauge bosons can facilitate dark matter production in
the early Universe by creating a ‘dynamic’ portal, which depends on the energy
of the process. The required smallness of the strength of the portal
interaction, suited for freeze-in, is justified by a suppression arising from
the mass of a heavy vector-like fermion. The strong temperature sensitivity
associated with the interaction is responsible for most of the dark matter
production during the early stages of reheating.
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