Abstract
Two recent papers reconsider the possibility that the WMAP haze is due to the synchrotron emission originated by neutralino self-annihilation; also upper bounds on the neutralino self-annihilation cross section are suggested. We show that for thermal weakly interacting massive particles (WIMPs) in a standard cosmological model, when the galactic WIMP density is duly rescaled for subdominant WIMPs, the upper bound applicable generically to any signal due to self-conjugate WIMPs is more stringent than the ones obtained from analysis of the WMAP haze. We also argue that an experimental upper bound, which can compete with our generic upper limit, can rather be derived from measurements of cosmic antiproton fluxes. Finally, we comment on the possible impact of our generic upper bound on the interpretation of the WMAP haze in terms of thermal neutralinos in a standard cosmological scheme.
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