Significant Gamma Lines from Inert Higgs Dark Matter

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  • 29 March 2007
Abstract
One of the most minimal models for dark matter is obtained by adding another Higgs doublet with no direct coupling to fermions. In this so-called Inert Doublet Model it has been shown that the particle playing the role of the usual Higgs may naturally be very heavy, of the order of 500 GeV, without violating electroweak precision bounds. The unbroken discrete symmetry that makes the new scalars inert also means that the lightest is a natural dark matter candidate. For a mass between 40 and 80 GeV, such a particle can give the correct cosmic abundance as measured by WMAP. We show that the loop-induced monochromatic \gamma\gamma and the Z\gamma final states would be exceptionally strong for this dark matter candidate. The energy range and rates for these line processes make them ideal to search for in the upcoming GLAST satellite experiment.

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