The Gravitino-Stau Scenario after Catalyzed BBN
نویسنده
چکیده
We consider the impact of Catalyzed Big Bang Nucleosynthesis on theories with a gravitino LSP and a charged slepton NLSP. In models where the gravitino to gaugino mass ratio is bounded from below, we derive a lower bound on the gaugino mass parameter m1/2. As a concrete example, we determine the parameter space of gaugino mediation that is compatible with all cosmological constraints. Email: [email protected] Email: [email protected]
منابع مشابه
Gravitino Dark Matter in the CMSSM With Improved Constraints from BBN
In the framework of the Constrained MSSM we re–examine the gravitino as the lightest superpartner and a candidate for cold dark matter in the Universe. Unlike in most of other recent studies, we include both a thermal contribution to its relic population from scatterings in the plasma and a non–thermal one from neutralino or stau decays after freeze–out. Relative to a previous analysis [1] we u...
متن کاملEluding the BBN constraints on the stable gravitino
We investigate how late-time entropy production weakens the Big-Bang Nucleosynthesis (BBN) constraints on the gravitino as lightest superparticle with a charged slepton as next-to-lightest superparticle. We find that with a moderate amount of entropy production, the BBN constraints can be eluded for most of the parameter space relevant for the discovery of the gravitino. This is encouraging for...
متن کاملGravitino Dark Matter and Light Element Adundances
We discuss the scenario where the gravitino is the lightest supersymmetric particle and the long-lived next-to-lightest sparticle (NSP) is the neutralino or the stau, the charged partner of the tau lepton. In this case staus form bound states with several nuclei, affecting the cosmological abundances of Li and Li by enhancing nuclear rates that would otherwise be strongly suppressed. We conside...
متن کاملGravitino Dark Matter in the CMSSM and Implications for Leptogenesis and the LHC
In the framework of the CMSSM we study the gravitino as the lightest supersymmetric particle and the dominant component of cold dark matter in the Universe. We include both a thermal contribution to its relic abundance from scatterings in the plasma and a non–thermal one from neutralino or stau decays after freeze–out. In general both contributions can be important, although in different region...
متن کاملCosmological Gravitino Problem in Gauge - Mediated Supersymmetry Breaking Models
We investigate the cosmological gravitino problem in gauge-mediated supersymmetry breaking models, where the gravitino becomes in general the lightest supersymmetric particle (LSP). In order to avoid the overclosure of the stable gravitino, the reheating temperature of inflation TR should be low enough. Furthermore, if the gravitino mass is larger than about 100 MeV, the decay of the next-to-LS...
متن کامل