4.6 Article

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

Journal

Publisher

IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2014/10/067

Keywords

dark matter theory; cosmology of theories beyond the SM; particle physics - cosmology connection

Funding

  1. NRF [2012R1A2A1A01006053]
  2. SRC program of NRF - MEST through Korea Neutrino Research Center at Seoul National University [20120001176]
  3. National Research Foundation of Korea [PG021402, 2009-0083526, 2012R1A2A1A01006053] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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We show that the 't Hooft-Polyakov monopole model in the hidden sector with Higgs portal interaction makes a viable dark matter 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, even though observed CMB data requires the dark gauge coupling to be quite small, a right amount of VDM thermal relic can be obtained via s-channel resonant annihilation for the mass of VDM close to or smaller than the half of SM higgs mass, thanks to Higgs portal interaction. Monopole relic density turns out to be several orders of magnitude smaller than the observed dark matter relic density. Direct detection experiments, particularly, the projected XENON1T experiment, may probe the parameter space where the dark Higgs is lighter than less than or similar to 50 GeV. In addition, the dark photon associated with the unbroken U(1)(X) contributes to the radiation energy density at present, giving Delta N-eff(nu) similar to 0.1 as the extra relativistic neutrino species.

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