Model independent limits on an ultralight gravitino from supernovae

Abstract

We revisit astrophysical constraints on models with an ultra-light gravitino, in particular extending the analysis to more general models and the case of R-parity breaking. These constraints allow to restrict the value of the gravitino mass depending on the masses of scalar moduli. We perform both a frequentist and bayesian analysis and we find comparable results, even if the bayesian analysis is in part affected by volume effects. Only a small window of gravitino masses can be excluded by the SN constraints in a model-independent way, while limits obtained with a definite assumption on the scalar masses result more stringent.

Right sneutrino with ΔL=2 masses as nonthermal dark matter

“…It is in this spirit that alternative candidates in small extensions of the minimal supersymmetric standard model (MSSM) have been explored. One example consists in scenarios with gravitino as warm DM [1][2][3][4][5][6][7][8][9]. Another, quite minimalistic, extension is to extend the MSSM with a right-chiral neutrino superfield for each family, and postulate that one right-sneutrino-dominated scalar is the DM candidate.…”