2005/06/30 by Karsten Jedamzik, Martin Lemoine, G. Moultaka +1 · 1 citation
Physics and Astronomy · #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Particle physics theoretical and experimental studies #astro-ph #hep-ph #hep-th
paper · pdf · doi:10.1103/physrevd.73.043514
published as Phys.Rev. D73 (2006) 043514 · 21 pages, 5 figures ; matches published version
openalex publication_date 2006/02/22 · arxiv created 2006/05/09 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
This paper investigates the parameter space of theories with gauge-mediated supersymmetry breaking leading to gravitino (cold) dark matter with mass m3/2\ensuremath∼1 keV\ensuremath→10 MeV. We pay particular attention to the cosmological role of messenger fields. Cosmology requires that these messengers decay to the visible sector if the lightest messenger mass MX\ensuremath\gtrsim30 TeV. We then examine the various possible messenger number violating interactions allowed by the symmetries of the theory and by phenomenology. Late messenger decay generally results in entropy production hence in the dilution of preexisting gravitinos. We find that in SU(5) grand unification only specific messenger-matter couplings allow to produce the required amount of gravitino dark matter particles. Gravitino dark matter with the correct abundance is, however, expected in larger gauge groups such as SO(10) for generic nonrenormalizable messenger-matter interactions and for arbitrarily high post-inflationary reheating temperatures.