Speaker
Dr
Chian-Shu Chen
(National Center for Theoretical Sciences)
Description
The halo dark matter (DM) can be gravitationally captured by the Sun. For
self-interacting DM (SIDM), we show that the number of DM trapped inside
the Sun remains unsuppressed even if the DM-nucleon cross section is
negligible. We consider a SIDM model where *U*(1) gauge symmetry is introduced
to account for the DM self-interaction. Such a model naturally leads to
isospin violation for DM-nucleon interaction, although isospin symmetry is
still allowed as a special case. We show that the indirect detection of
DM-induced neutrinos from the Sun can probe those SIDM parameter ranges not
reachable by direct detections. Those parameter ranges are either the
region with a very small *m* or the region opened up due to isospin
violations. The energy flows in and out of the system include the
gravitational capture via DM-nucleon and DM-DM scatterings, the energy
dissipation via DM annihilation,
and the heat exchange between DM and solar nucleus are studied. The DM
temperature can be higher than the core temperature of the Sun. We further
explore its impact on the DM indirect search signal.
Primary author
Dr
Chian-Shu Chen
(National Center for Theoretical Sciences)
Co-authors
Prof.
Guey-Lin Lin
(National Chiao Tung University)
Mr
Yen-Hsun Lin
(National Chiao Tung University)
