The dark matter self-interaction and its impact on the critical mass for dark matter evaporations inside the sun

Chian-Shu Chen; Fei-Fan Lee; Guey-Lin Lin; Yen-Hsun Lin

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arXiv · 1412.6739

The dark matter self-interaction and its impact on the critical mass for dark matter evaporations inside the sun

Chian-Shu Chen·Fei-Fan Lee·Guey-Lin Lin·Yen-Hsun Lin

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Abstract

We study the capture, annihilation and evaporation of dark matter (DM) inside the Sun. It has been shown that the DM self-interaction can increase the DM number inside the Sun. We demonstrate that this enhancement becomes more significant in the regime of small DM mass, given a fixed DM self-interaction cross section. This leads to the enhancement of neutrino flux from DM annihilation. On the other hand, for DM mass as low as as a few GeVs, not only the DM-nuclei scatterings can cause the DM evaporation, DM self-interaction also provides non-negligible contributions to this effect. Consequently, the critical mass for DM evaporation (typically 3 ~ 4 GeV without the DM self-interaction) can be slightly increased. We discuss the prospect of detecting DM self-interaction in IceCube- PINGU using the annihilation channels $\chi\chi\rightarrow\nu\bar{\nu},\:\tau^{-}\tau^{+}$ as examples. The PINGU sensitivities to DM self-interaction cross section $\sigma_{\chi\chi}$ are estimated for track and cascade events.

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Chian-Shu Chen, Fei-Fan Lee, Guey-Lin Lin, Yen-Hsun Lin. 2014-12-21. The dark matter self-interaction and its impact on the critical mass for dark matter evaporations inside the sun. https://arxiv.org/abs/1412.6739

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