Cosmic rays from leptonic dark matter

Chuan Ren Chen, Fuminobu Takahashi

Research output: Contribution to journalArticle

66 Citations (Scopus)

Abstract

If dark matter possesses a lepton number, it is natural to expect the dark-matter annihilation and/or decay mainly produces the standard model leptons, while negligible amount of the antiproton is produced. To illustrate such a simple idea, we consider a scenario that a right-handed sneutrino dark matter decays into the standard model particles through tiny R-parity violating interactions. Interestingly enough, charged leptons as well as neutrinos are directly produced, and they can lead to a sharp peak in the predicted positron fraction. Moreover, the decay of the right-handed sneutrino also generates diffuse continuum gamma rays which may account for the excess observed by EGRET, while the primary antiproton flux can be suppressed. Those predictions on the cosmic-ray fluxes of the positrons, gamma rays and antiprotons will be tested by the PAMELA and FGST observatories.

Original languageEnglish
Article number004
JournalJournal of Cosmology and Astroparticle Physics
Volume2009
Issue number2
DOIs
Publication statusPublished - 2009 May 25

Keywords

  • Cosmic rays
  • Dark matter

ASJC Scopus subject areas

  • Astronomy and Astrophysics

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