PAMELA's cosmic positron from decaying LSP in SO(10) SUSY GUT

Abstract

We propose two viable scenarios explaining the recent observations on cosmic positron excess. In both scenarios, the present relic density in the Universe is assumed to be still supported by thermally produced WIMP or LSP (χ). One of the scenarios is based on two dark matter (DM) components (χ,X) scenario, and the other is on SO(10) SUSY GUT. In the two DM components scenario, extremely small amount of non-thermally produced meta-stable DM component [O(10^{-10}) < n_X /n_χ] explains the cosmic positron excess. In the SO(10) model, extremely small R-parity violation for LSP decay to e^\pm is naturally achieved with a non-zero VEV of the superpartner of one right-handed neutrino (\tildeν^c) and a global symmetry.

6 pages, Talks presented in PASCOS, SUSY, and COSMO/CosPA in 2010

References in corpus (9)

• Observation of an anomalous positron abundance in the cosmic radiation
• Measurement of the Cosmic Ray e+ plus e- spectrum from 20 GeV to 1 TeV with the Fermi Large Area Telescope
• A new measurement of the antiproton-to-proton flux ratio up to 100 GeV in the cosmic radiation
• On possible interpretations of the high energy electron-positron spectrum measured by the Fermi Large Area Telescope
• Decaying Dark Matter can explain the electron/positron excesses
• Gamma-ray and radio tests of the e+e- excess from DM annihilations
• Two dark matter components in N_{DM}MSSM and dark matter extension of the minimal supersymmetric standard model and the high energy positron spectrum in PAMELA/HEAT data
• PAMELA/ATIC anomaly from the meta-stable extra dark matter component and the leptophilic Yukawa interaction
• PAMELA/ATIC Anomaly from Exotic Mediated Dark Matter Decay