Sofia Sivertsson, Joakim Edsjo
Weakly Interacting Massive Particles (WIMPs) can be captured by the Sun and
the Earth, sink to their cores, annihilate and produce neutrinos that can be
searched for with neutrino telescopes. The calculation of the capture rates of
WIMPs in the Sun and especially the Earth are affected by large uncertainties
coming mainly from effects of the planets in the solar system, reducing the
capture rates by up to an order of magnitude (or even more in some cases). We
show that the WIMPs captured by weak scatterings in the Sun also constitute an
important bound WIMP population in the solar system. Taking this population and
its interplay with the population bound through gravitational diffusion into
account cancel the planetary effects on the capture rates, and the capture
essentially proceeds as if the Sun and the Earth were free in the galactic
halo. The neutrino signals from the Sun and the Earth are thus significantly
higher than claimed in the scenarios with reduced capture rates.
View original:
http://arxiv.org/abs/1201.1895
No comments:
Post a Comment