Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-04-04
Phys.Lett.B645:222-227,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
8 pages - version to appear in Phys.Lett.B ; discussion of one loop annihilation cross-section modified, conclusions unchanged
Scientific paper
10.1016/j.physletb.2006.12.025
It is shown that gravitinos with mass m_{3/2} ~ 0.1-1 MeV may provide suitable cold dark matter candidates in scenarios of gauge mediated supersymmetry breaking (GMSB) under SO(10) grand unification coupled to supergravity, which accommodate a messenger sector of mass scale M_X ~ 10^6 GeV. This is due to the combined effects of renormalizable loop-suppressed operators and generic non-renormalizable ones governing the dilution of a pre-existing equilibrium gravitino abundance via messenger decay. The above range of gravitino and messenger masses can be accommodated in indirect GMSB scenarios. The gravitino abundance does not depend on the post-inflationary reheat temperature and it is shown that leptogenesis can generate successfully the baryon asymmetry.
Jedamzik Karsten
Lemoine Martin
Moultaka Gilbert
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