Speaker
Dr
Gilbert Moultaka
(LPTA-Montpellier, UMR5207-UM2/IN2P3/CNRS)
Description
In gauge mediated supersymmetry breaking models the relatively light
messenger and/or secluded sectors can be partly present in the early
universe, depending on the value of the reheat temperature. In particular, a
relic stable lightest messenger scalar field with a mass greater than a few
tens of TeV would typically lead to an overcloser problem. Relying on a
recently studied scenario in the context of a (supergravity coupled) unifying
$SO(10)$ gauge group, where a solution to this problem can yield cold dark
matter light gravitinos even for a very high reheat temperature, we calculate
the full one-loop induced lightest messenger annihilation into a pair
of gluons, which is the leading process in the determination of the relic
abundance of this MSSM singlet messenger. We also analyze, in terms of the
messenger and spurion parameters, the ensuing gravitino abundance due to
entropy dilution, assuming Planck scale reduced messenger decay into MSSM
particles as well as thermal and non-thermal gravitino production.
[based on Phys.Lett.B645:222-227,2007, Phys.Rev.D73:043514,2006,
JCAP 0607:010,2006]
Author
Dr
Gilbert Moultaka
(LPTA-Montpellier, UMR5207-UM2/IN2P3/CNRS)
