Gravitational violation of R parity and its cosmological signatures
The discrete R-parity (RP) usually imposed on the Supersymmetric (SUSY) models is expected to be broken at least gravitationally. If the neutralino is a dark matter particle its decay channels into positrons, antiprotons and neutrinos are severely constrained from astrophysical observations. These constraints are shown to be violated even for Planck-mass-suppressed dimension-five interactions arising from gravitational effects. We perform a general analysis of gravitationally induced RP violation and identify two plausible and astrophysically consistent scenarios for achieving the required suppression.
Berezinsky, Veniamin Joshipura, Anjan S. Furtado Valle, José Wagner 1998 Gravitational violation of R parity and its cosmological signatures Physical Review D 57 1 147 151