Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...321..560g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 321, Oct. 1, 1987, p. 560-570.
Astronomy and Astrophysics
Astrophysics
81
Elementary Particle Interactions, Particle Density (Concentration), Solar Corpuscular Radiation, Solar Neutrinos, Weak Interactions (Field Theory), Mathematical Models, Maxwell-Boltzmann Density Function
Scientific paper
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.
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