Implications of a new Solar system population of neutralinos on indirect detection rates

Recently, a new Solar System population of weakly interacting massiveparticle (WIMP) dark matter has been proposed to exist. We investigate theimplications of this population on indirect signals in neutrino telescopes (dueto WIMP annihilations in the Earth) for the case when the WIMP is the lightestneutralino of the MSSM, the minimal supersymmetric extension of the standardmodel. The velocity distribution and capture rate of this new population isevaluated and the flux of neutrino-induced muons from the center of the Earthin neutrino telescopes is calculated. The strength of the signal is verysensitive to the velocity distribution of the new population. We analyticallyestimate this distribution using the approximate conservation of the componentof the WIMP angular momentum orthogonal to the ecliptic plane. The non-linearproblem of combining a fixed capture rate from the standard galactic WIMPpopulation with one rising linearly with time from the new population to obtainthe present-day annihilation rate in the Earth is also solved analytically. Weshow that the effects of the new population can be crucial for masses belowaround 150 GeV, where enhancements of the predicted muon flux from the centerof the Earth by up to a factor of 100 compared to previously publishedestimates occur. As a result of the new WIMP population, the next generation ofneutrino telescopes should be able to probe a much larger region of parameterspace in the mass range 60-130 GeV.Comment: 21 pages, 5 eps figures, uses JHEP.cls. Figures made more readable, references updated. Matches published versio