Minimal dark matter: Model and results

Abstract

We recap the main features of minimal dark matter (MDM) and assess its status in the light of recent experimental data. The theory selects an electroweak 5-plet with hypercharge Y = 0 as a fully successful DM candidate, automatically stable against decay and with no free parameters: DM is a fermion with a 9.6 TeV mass. The direct detection cross-section, predicted to be 10 -44 cm2, is within reach of next-generation experiments. DM is accompanied by a charged fermion 166MeV heavier: we discuss how it might manifest. Thanks to an electroweak Sommerfeld enhancement of more than 2 orders of magnitude, DM annihilations into W+W- give, in the presence of a modest astrophysical boost factor, an e+ flux compatible with the PAMELA excess (but not with the ATIC hint for a peak: MDM instead predicts a quasi-power-law spectrum), a p̄ flux concentrated at energies above 100 GeV, and photon fluxes comparable with present limits, depending on the DM density profile. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.