WIMP capture by the Sun in the effective theory of dark matter
  self-interactions
  We study the capture of WIMP dark matter by the Sun in the non-relativistic
effective theory of dark matter self-interactions. The aim is to assess the
impact of self-interactions on the expected neutrino flux from the annihilation
of WIMPs trapped in the Sun in a model independent manner. We consider all
non-relativistic Galilean invariant self-interaction operators that can arise
from the exchange of a heavy particle of spin less than or equal to 1 for WIMPs
of spin equal to 0, 1/2 and 1. We show that for interaction operators depending
at most linearly on the momentum transfer, the WIMP-induced neutrino flux can
be enhanced by several orders of magnitude compared to the same flux in absence
of self-interactions. This is true even for standard values of the thermally
averaged annihilation cross-section. This conclusion impacts the analysis of
present and future observations performed at neutrino telescopes.
