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Weakly interacting massive particle densities in decaying-particle-dominated cosmology

Research output: Contribution to Journal/MagazineJournal articlepeer-review

  • John McDonald
<mark>Journal publication date</mark>15/02/1991
<mark>Journal</mark>Physical Review D
Issue number4
Number of pages6
Pages (from-to)1063-1068
Publication StatusPublished
<mark>Original language</mark>English


We consider the present cosmological density of weakly interacting massive particles (WIMP's) in the context of models where the energy density is dominated by decaying massive particles, such that WIMP's freeze out of chemical equilibrium during the massive-particle-dominated era. An expression for the density of WIMP's is derived by a generalization of the Lee-Weinberg argument for the density of heavy neutrinos in the standard cosmological model.