Hidden sector monopole, vector dark matter and dark radiation with Higgs portal

por Dr. Wanil Park (KIAS)

miércoles 2 abr. 2014 15:00 → 15:30 Europe/Madrid

4-4-4426 - Seminari Física Teòrica (Campus Burjassot)

We show that the ’t Hooft-Polyakov monopole model in the hidden sector with Higgs portal interaction makes a viable DM model, where monopole and massive vector dark matter (VDM) are stable due to topological conservation and the unbroken subgroup U(1)X. We show that monopole relic density is diluted enough whereas VDM can be thermalized by the Higgs portal interaction, and direct detection experiments can probe some region of parameter space. The proposed XENON1T experiment may detect the VDM if its mass is less than 60 GeV. In addition, the dark photon associated with unbroken U(1)X contributes to the radiation energy density at present, giving N_{eff}~0.1 as the extra relativistic neutrino species.