On an Einstein-de Sitter universe of radiating massive photinos

Details On an Einstein-de Sitter universe of radiating massive photinos On an Einstein-de Sitter universe of radiating massive photinos

Jul 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982phlb..114...19s&link_type=abstract

Physics Letters B, Volume 114, Issue 1, p. 19-22.

Physics

22

Scientific paper

Photons emitted by massive photinos (γ) formed in the hot big bang could ionise the intergalactic medium and galactic halos to the observed extent if mγ ~ 100 eV and the radiative lifetime τ ~ 1027 s. These photinos could have the critical Einstein-de Sitter density if they decoupled at T ~ 200 MeV. Supersymmetric theories then indicate that the order parameter d is roughly 108 GeV2. This estimate would be numerically consitent with particle-physics estimates or limits on the grand unification scale, the boson-fermion mass splitting, and the mass of the gravitino, and would lead to a value of τ comparable to the astronomical one.

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