# ICHEP 2014

2-9 July 2014
Valencia, Spain

## The Dark Matter Self-Interaction and Its Impact on the Critical Mass for Dark Matter Evaporations Inside the Sun

3 Jul 2014, 15:42
18m
Auditorium 3A ()

### Auditorium 3A

Oral presentation Astroparticle Physics and Cosmology

### Speaker

Mr. Yen-Hsun Lin (IoP, Nat'l Chiao Tung University, Hsinchu, Taiwan)

### Description

It has been shown that the self-interaction between dark matter (DM) particles can increase the DM number density inside the Sun. The increasing rate of DM number density by this effect is proportional to the existing DM number density inside the Sun. We demonstrate that this effect can counteract DM evaporations in the regime of small DM mass. Consequently, the critical mass for DM evaporations (typically $3\sim 4$ GeV without the self-interaction) can be lowered down by DM self-interactions. Hence the DM annihilation rate for $m_{\chi}$ around few GeVs may be enhanced by self-interactions. This leads to the enhancement of neutrino flux from such annihilations. We discuss the prospect of observing such enhanced neutrino flux in IceCube-PINGU using the annihilation channels $\chi\chi\to \tau^+\tau^- , \, \nu\bar{\nu}$ as examples. The PINGU sensitivities to DM self-interaction cross section $\sigma_{\chi\chi}$ are estimated for track and cascade events.

### Primary authors

Dr. Chian-Shu Chen (Physics Division, National Center for Theoretical Sciences, Hsinchu, Taiwan) Dr. Fei-Fan Lee (IoP, Nat'l Chiao Tung University, Hsinchu, Taiwan) Prof. Guey-Lin Lin (IoP, Nat'l Chiao Tung University, Hsinchu, Taiwan) Mr. Yen-Hsun Lin (IoP, Nat'l Chiao Tung University, Hsinchu, Taiwan)

### Presentation Materials

 ICHEP2014-YHLin.pdf ICHEP2014-YHLin.pptx

### Paper

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