Neutrino forces and the Sommerfeld enhancement
Rupert Coy, Xun-Jie Xu, Bingrong Yu
TL;DR
This paper investigates how neutrino-mediated forces can alter the Sommerfeld enhancement effect, impacting dark matter annihilation rates and phenomenology.
Contribution
It introduces the effect of neutrino forces on Sommerfeld enhancement and discusses models with dark matter-neutrino interactions.
Findings
Neutrino forces can significantly modify the Sommerfeld enhancement.
Certain models exhibit sizeable Sommerfeld enhancement due to neutrino interactions.
Implications for dark matter phenomenology are explored.
Abstract
The Sommerfeld enhancement plays an important role in dark matter (DM) physics, and can significantly enhance the annihilation cross section of non-relativistic DM particles. In this paper, we study the effect of neutrino forces, which are generated by the exchange of a pair of light neutrinos, on the Sommerfeld enhancement. We demonstrate that in certain cases, a neutrino force can cause a significant correction to the Sommerfeld enhancement. Models that can realise DM-neutrino interactions and sizeable Sommerfeld enhancement are also briefly discussed, together with the impacts on DM phenomenology of neutrino forces.
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