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The direct searches for heavy scalar dark matter with a mass of order 100 GeVare much more sensitive than for light dark matter of order 1 GeV. The questionarises whether dark matter could be light and has escaped detection so far. Westudy a simple extension of the Standard Model with two additional realsinglets. We show that this simple extension may provide the observed relicdark matter density, does neither disturb big-bang nucleosynthesis nor thecosmic microwave background radiation observations and fulfills the conditionsof clumping behavior for different sizes of galaxies. The potential of oneStandard Model-like Higgs-boson doublet and the two singlets gives rise to achanged Higgs phenomenology, in particular, an enhanced invisible Higgs-bosondecay rate is expected, detectable by missing transversal momentum searches atthe ATLAS and CMS experiments at CERN.

Light dark matter in a minimal extension with two additional real singlets