Orateur
Description
The magnetic monopole of a dark sector has been advocated as an appealing dark matter candidate. We recently revisited the computation of the monopole abundance, produced by a thermal phase transition in the minimal 't Hooft-Polyakov model. We explored the three regimes where the phase transition is second order, weakly first order, or supercooled, identifying the regions of parameter space where the monopole abundance can account for the observed dark matter density. However, the dark sector necessarily contains a stable electrically-charged particle, namely, a massive vector boson, with a calculable abundance. Under minimal assumptions, we show that the vector boson always dominates the dark matter density: dark monopoles cannot constitute a sizeable fraction of dark matter.
