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In supersymmetric models extended with an anomalous $U(1)_H$ differentR-parity violating couplings can yield an unstable neutralino. We show that inthis context astrophysical and cosmological constraints on neutralino decayingdark matter forbid bilinear R-parity breaking neutralino decays and lead to aclass of purely trilinear R-parity violating scenarios in which the neutralinois stable on cosmological scales. We have found that among the resulting modelssome of them become suitable to explain the observed anomalies in cosmic-rayelectron/positron fluxes.

Decaying neutralino dark matter in anomalous $U(1)_H$ models