Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
<mark>Journal publication date</mark> | 15/02/1991 |
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<mark>Journal</mark> | Physical Review D |
Issue number | 4 |
Volume | 43 |
Number of pages | 6 |
Pages (from-to) | 1063-1068 |
Publication Status | Published |
<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.