Boosting Assisted Annihilation for a Cosmologically Safe MeV Scale Dark Matter. (arXiv:1812.11418v1 [hep-ph])
<a href="http://arxiv.org/find/hep-ph/1/au:+Dey_U/0/1/0/all/0/1">Ujjal Kumar Dey</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Maity_T/0/1/0/all/0/1">Tarak Nath Maity</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Ray_T/0/1/0/all/0/1">Tirtha Sankar Ray</a>
Assisted annihilation generates thermal sub-GeV dark matter through a novel
annihilation between a pair of dark matter and one or more SM-like states,
called the textit{assisters}. We show that depending on the mass hierarchy
between the assister and dark matter there can be either a suppression or a
boost from the Boltzmann factor in the effective cross section. This
augmentation enables the possibility of MeV scale thermal dark matter with
perturbative coupling that saturate the relic density estimates while being
relatively insulated from cosmological constraints like BBN and CMB.
Assisted annihilation generates thermal sub-GeV dark matter through a novel
annihilation between a pair of dark matter and one or more SM-like states,
called the textit{assisters}. We show that depending on the mass hierarchy
between the assister and dark matter there can be either a suppression or a
boost from the Boltzmann factor in the effective cross section. This
augmentation enables the possibility of MeV scale thermal dark matter with
perturbative coupling that saturate the relic density estimates while being
relatively insulated from cosmological constraints like BBN and CMB.
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