1995/05/31 by John Ellis, D.V. Nanopoulos, D. V. Nanopoulos +3 · 9 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Pulsars and Gravitational Waves Research #astro-ph #hep-ph
paper · pdf · doi:10.1016/0927-6505(96)00006-0
published as Astropart.Phys.4:371-386,1996 · REVTEX 32 pages, two encapsulated ps figure files
arxiv created 1995/05/31 · openalex publication_date 1996/04/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We investigate the light gravitino regeneration rate in the early Universe in models based on N=1 supergravity. Motivated by a recent claim by Fischler, we evaluate finite-temperature effects on the gravitino regeneration rate due to the hot primordial plasma for a wide range of the supersymmetry-breaking scale F. We find that thermal corrections to the gravitino pole mass and to the Goldstino coupling are negligible for a wide range of temperatures, thereby justifying the extension of the equivalence theorem for the helicity-1/2 gravitino and Goldstino to a hot primordial plasma background. Utilizing the Braaten-Pisarski resummation method, the helicity-1/2 gravitino regeneration rate is found to be 0.25 αs(T) log(1/αs(T))|m\rm soft/F|2 T3(1 + αs(T) log(1/αs(T)) + T2 / |F|) up to a calculable, model-dependent \cal O(1) numerical factor. We review the implications of this regeneration rate for supergravity cosmology, focusing in particular on scenaria for baryogenesis.