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arXiv · 2304.07180

Effective Field Theories for Dark Matter Pairs in the Early Universe

Simone Biondini·Nora Brambilla·Gramos Qerimi·Antonio Vairo
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Abstract

In this conference paper, we consider effective field theories of non-relativistic dark matter particles interacting with a light force mediator in the early expanding universe. We present a general framework, where to account in a systematic way for the relevant processes that may affect the dynamics during thermal freeze-out. In the temperature regime where near-threshold effects, most notably the formation of bound states and Sommerfeld enhancement, have a large impact on the dark matter relic density, we scrutinize possible contributions from higher excited states and radiative corrections in the annihilations and decays of dark-matter pairs.

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Simone Biondini, Nora Brambilla, Gramos Qerimi, Antonio Vairo. 2023-04-14. Effective Field Theories for Dark Matter Pairs in the Early Universe. https://doi.org/10.31526/lhep.2023.375

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