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We investigate the superWIMP scenario in the framework of supersymmetry, in which the lightest supersymmetric particle (LSP) is a stable gravitino. We consider slepton, sneutrino or neutralino being the next-lightest supersymmetric particle (NLSP), and determine what superpartner masses are viable, applying cosmic-microwave background (CMB) and… (More)

Cosmological issues are examined when gravitino is the lightest superparticle (LSP) and R-parity is broken. Decays of the next lightest superparticles occur rapidly via R-parity violating interaction, and thus they do not upset the big-bang nucleosynthesis, unlike the R-parity conserving case. The gravitino LSP becomes unstable, but its lifetime is… (More)

- Wilfried Buchmüller, Alejandro Ibarra, Tetsuo Shindou, Fumihiro Takayama, David Tran
- 2009

We analyse the cosmic-ray signatures of decaying gravitino dark matter in a model-independent way based on an operator analysis. Thermal leptogenesis and universal boundary conditions at the GUT scale restrict the gravitino mass to be below 600 GeV. Electron and positron fluxes from gravitino decays, together with the standard GALPROP background, cannot… (More)

We evaluate the prospects for finding evidence of dark matter production at the CERN Large Hadron Collider. We consider weakly interacting massive particles (WIMPs) and superWIMPs and characterize their properties through model-independent parametrizations. The observed relic density then implies lower bounds on dark matter production rates as functions of… (More)

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