Abstract
In the standard model, the weak gauge bosons and fermions obtainmass after spontaneous electro-weak symmetry breaking, which isrealized by one fundamental scalar field, namely the Higgs field.We study the simplest scalar cold dark matter modelin which the scalar cold dark matter also obtains mass byinteraction with the weak-doublet Higgs field, in the same way asthose of weak gauge bosons and fermions. Our study shows that thecorrect cold dark matter relic abundance within 3σuncertainty (0.093<Ωdmh2<0.129) andexperimentally allowed Higgs boson mass (114.4⩽mh⩽208 GeV)constrain the scalar dark matter mass within 48⩽mS⩽78 GeV. This result is in excellent agreement with the result of deBoer et al. (50~100 GeV). Such a kind of dark matterannihilation can account for the observed gamma rays excess(10σ) at EGRET for energies above 1 GeV in comparison withthe expectations from conventional Galactic models. We alsoinvestigate other phenomenological consequences of this model. Forexample, the Higgs boson decays dominantly into scalar cold darkmatter if its mass lies within 48~64 GeV.
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