Higgs Dark Matter from a Warped Extra-Dimension – the truncated-inert-doublet model (original) (raw)
We construct a 5D Z 2 -symmetric model with three D3-branes: two IR ones with negative tension located at ends of an extra-dimensional interval and one UV-brane with positive tension placed in the middle of the interval. Within this setup we investigate the low-energy effective theory for the bulk SM bosonic sector. The Z 2 -even zero-modes correspond to known standard degrees of freedom, whereas the Z 2 -odd zero modes might serve as dark sector. We discuss two scenarios for spontaneous breaking of the gauge symmetry, one based on expansion of the bulk Higgs field around extra-dimensional vev with non-trivial profile and the second in which the symmetry breaking is triggered by a vev of Kaluza-Klein modes of the bulk Higgs field. It is shown that they lead to the same low-energy effective theory. The effective low-energy scalar sector contains a scalar which mimics the Standard Model (SM) Higgs boson and a second stable scalar particle (dark-Higgs) that is a dark matter candidate; the latter is a component of the zero-mode of Z 2 -odd Higgs doublet. The model that results from the Z 2 -symmetric background geometry resembles the Inert Two Higgs Doublet Model. The effective theory turns out to have an extra residual SU (2)×U (1) global symmetry that is reminiscent of an underlying 5D gauge transformation for odd degrees of freedom. At tree level the SM Higgs and the dark-Higgs have the same mass; however, when leading radiative corrections are taken into account the dark-Higgs turns out to be heavier than the SM Higgs. Implications for dark matter are discussed; it is found that the dark-Higgs can provide only a small fraction of the observed dark matter abundance.
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