Cosmic e^\pm, \bar p, \gamma and neutrino rays in leptocentric dark matter models

TL;DR

This paper explores a leptocentric dark matter model that explains cosmic ray electron and positron excesses while suppressing anti-proton production at low energies, predicts anti-proton excesses at higher energies, and suggests observable neutrino signals.

Contribution

It introduces a $U(1)_{B-3L_i}$ dark matter model that accounts for cosmic ray anomalies with specific anti-proton suppression and predicts distinctive high-energy anti-proton and neutrino signatures.

Findings

Leptocentric $U(1)_{B-3L_i}$ model explains $e^\pm$ excesses.

Anti-proton suppression at low energies with potential excess at high energies.

Predicted neutrino signatures offer additional observational tests.

Abstract

Dark matter annihilation is one of the leading explanations for the recently observed $e^\pm$ excesses in cosmic rays by PAMELA, ATIC, FERMI-LAT and HESS. Any dark matter annihilation model proposed to explain these data must also explain the fact that PAMELA data show excesses only in $e^\pm$ spectrum but not in anti-proton. It is interesting to ask whether the annihilation mode into anti-proton is completely disallowed or only suppressed at low energies. Most models proposed have negligible anti-protons in all energy ranges. We show that the leptocentric $U(1)_{B-3L_i}$ dark matter model can explain the $e^\pm$ excesses with suppressed anti-proton mode at low energies, but at higher energies there are sizable anti-proton excesses. Near future data from PAMELA and AMS can provide crucial test for this type of models. Cosmic $\gamma$ ray data can further rule out some of the models. We also show that this model has interesting cosmic neutrino signatures.