Speaker
Lorenzo De Ros
Description
We examine the Sommerfeld enhancement in dark matter pair annihilation, scrutinizing p- and higher ℓ-wave annihilations. We focus on the Yukawa potential, noting unexpected velocity scaling and resonant behavior, attributed to the presence of quasi-bound states. We provide a quantum mechanical explanation for the phenomenon and for its features using the WKB approximation. We examine the impact of quasi-bound states for Wino dark matter and DM models with light mediators, discussing implications for relic abundance and indirect detection signals.