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arXiv · 1812.11418

Boosting Assisted Annihilation for a Cosmologically Safe MeV Scale Dark Matter

Ujjal Kumar Dey·Tarak Nath Maity·Tirtha Sankar Ray
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Abstract

Assisted annihilation generates thermal sub-GeV dark matter through a novel annihilation between a pair of dark matter and standard-model-like states, called the "assister". We show that, depending on the mass hierarchy between the assister and dark matter, there can be either a suppression or a boost of the effective cross section. This augmentation enables the possibility of $\mathcal{O}(100)$ MeV scale dark matter with perturbative coupling that saturates the relic density estimates while being relatively insulated from cosmological constraints like big bang nucleosynthesis and cosmic microwave background.

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Ujjal Kumar Dey, Tarak Nath Maity, Tirtha Sankar Ray. 2018-12-29. Boosting Assisted Annihilation for a Cosmologically Safe MeV Scale Dark Matter. https://doi.org/10.1103/physrevd.99.095025

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