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The paper analyzes the evaporation of weakly interacting massive particles (WIMPs) from the sun, both analytically and numerically. First, an analytic approximation is made by defining an appropriate truncation of a Maxwell-Boltzmann distribution for the WIMPs and calculating the exact evaporation rate from this distribution due to interaction with a truly thermal distribution of nuclei. Then, the actual (nonthermal) distribution of Dirac neutrino WIMPs in the sun is calculated numerically for WIMPs of mass 1-7 GeV. Evaporation from the actual and thermal distributions is compared. It is found that the evaporation mass for a solar lifetime is 3.7 GeV, and for an 'annihilation lifetime', 2.9 GeV. These are about 8 percent lower than the most well-reasoned previous estimate.
Andrew Gould (Thu,) studied this question.