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

doi:10.1016/j.nuclphysbps.2015.09.049

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∼4GeV 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 χχ→τ+τ−, νν‾ as examples. The PINGU sensitivities to DM self-interaction cross section σχχ are estimated for track and cascade events.

Highlights

In this talk, we present the general framework of dark matter (DM) capture, annihilation and evaporation in the Sun
We have presented the time evolution of DM number trapped inside the Sun with DM self-interaction considered
We focused on the low mχ range which requires the consideration of evaporation effects due to both DM-nuclei and DM-DM scatterings

Summary

INTRODUCTION

We present the general framework of DM capture, annihilation and evaporation in the Sun. [15] used the IceCube data [16] to constrain the magnitude of σχχ for mχ in the range of O(10) GeV to O(1) TeV In their work the evaporation effect can be neglected for the considered DM mass range In this presentation we shall concentrate on the low mass region of O(1) GeV DM mass since such a mass range has not been probed by the IceCube data mentioned above. This is the mass range where the indirect search is crucial. For spin-dependent interaction, the IceCube-PINGU sensitivity has been estimated to be much better than constraints set by direct detection experiments [20]

DM ACCUMULATION IN THE SUN

PROBING DM SELF-INTERACTION AT ICECUBE-PINGU

Findings

CONCLUSION