The cosmological relic density of the lightest supersymmetric particle, assumed to be a linear combination of the four neutralinos, is calculated to high precision using the exact tree-level annihilation cross section for all two-body final states.
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We thankA . Srivistavafo r helpfuld iscussionsT.h e work of J.M. and K.A.O. was supportedin part by DOE Grant No. DE-AC02-83ER-40105a,n d by a PresidentiaYlo ungI nvestigatoArw ard.T he work of M.S. wass upporteidn partb y NSF GrantN o. PHY-86-14185.