M.
Sean Bailly
(LAPTH)
29/07/2010 10:45
Dark Matter Candidates
Talk
In the context of supersymmetric models with R-parity conservation, the gravitino is a possible candidate for dark matter when it is the lightest supersymmetric particle. The gravitino can be produced during reheating after inflation or from the decay of the next to lightest supersymmetric particle (NLSP). The unstable particle can be long-lived and decay during big bang nucleosynthesis. The...
Dr
carlos yaguna
(universidad autonoma de madrid)
29/07/2010 11:05
Talk
We consider the three-body decays of gravitino dark matter in supersymmetric scenarios with bilinear R-parity violation. In particular, gravitino decays into lepton+W^* (lepton f\bar f') and \nu+Z^* (\nu f\bar f) are examined for gravitino masses below Mw. After computing the gravitino decay rates into these three-body final states and studying their dependence on supersymmetric parameters, we...
M.
Francesco D'Eramo
(Massachusetts Institute of Technology)
29/07/2010 11:25
Dark Matter Candidates
Talk
We show that the thermal relic abundance of dark matter can be affected by a new type of reaction: semi-annihilation. Semi-annihilation takes the schematic form X_i X_j -> X_k phi, where X_i are stable dark matter particles and phi is an unstable state. Such reactions are generically present when dark matter is composed of more than one species with "flavor" and/or "baryon" symmetries. We give...
Annika Peter
(Caltech)
29/07/2010 11:45
Dark Matter Candidates
Talk
We explore a dark-matter model in which there are two dark-matter species nearly degenerate in mass, with $\epsilon = \delta M/M \ll 1$. The heavier particle undergoes two-body decay to the lighter dark-matter particle and a massless particle with a half-life $\tau$. Unlike previous work on decaying dark matter, we explore the regime $\tau > 100$ Myr and non-relativistic kick speeds $v_k / c...
