Strong dark matter constraints on GMSB models

Abstract

We reconsider the dark matter problem in supersymmetric models with gauge mediated supersymmetry breaking, with and without R-parity breaking. In these classes of models, a light gravitino forms the dark matter. Consistency with the experimental data, in particular the dark matter abundance and the small-scale power spectrum, requires additional entropy production after the decoupling of the gravitino from the thermal bath. We demonstrate that the usual mechanism via messenger number violating interactions does not work in models where the messenger belongs to SU(5) representations. This is mainly a consequence of two facts: (i) there are at least two different types of lightest messenger particles and (ii) the lightest messenger particle with SU(2) quantum numbers decays dominantly into vector bosons once messenger number is broken, a feature which has been overlooked so far. In case of SO(10) messenger multiplets we find scenarios which work if the SM gauge singlet component is rather light.

From superpotential to model files for FeynArts and CalcHep/CompHep

“…In addition we have calculated the relic density with micrOmegas for two different set of parameters. A recent version of SARAH was also used for [9] and the results were cross checked in several ways. Also one of the authors of [16] The different parts are: The superfield name, the dimension of the gauge group, the name of the gauge group and the name of the gauge coupling.…”

Low Mass Gravitino: Re-Introducing the Superpartner as Dark Matter with Consideration to Inflation Due to Experimentation

“…The masses from present primordial black holes accordingly would compensate for the low mass of the gravitino; all dark matter bodies would contribute to nearby, characteristic events. Again other dark matter possibly accompanying the gravitino has been proposed, discussions having involved the gravitino as warm dark matter (Staub, Porod, & Niemeyer, 2010). This work has been a first presentation suggesting gravitinos and primordial black holes could be cold dark matter simultaneously.…”

“…At least two types of lightest messenger particles exist, and the lightest messenger particle with SU(2) quantum numbers would decay dominantly to vector bosons when the messenger number is broken. Accordingly, a problem would have been that the decays of messengers and superparticles would have occurred too quickly (Staub, Porod, & Niemeyer, 2010;Staub, 2008).…”

Focus point supersymmetry in extended gauge mediation

“…Here, M Pl = 2.4 × 10 18 GeV is the reduced Planck mass. One of the most intriguing feature is that at high M * scale, the LSP in mass spectrum will naturally become the neutralino which is the promising dark matter candidate which does not suffer from the cosmological gravitino problem [145][146][147][148][149][150][151]. To demonstrate this feature, we show the mass ratio of the gravitino and neutralino.…”