Abstract
We construct a 5D \( {\mathrm{\mathbb{Z}}}_2 \)-symmetric model with three D3-branes: two IR ones with negative tension located at the ends of an extra-dimensional interval and a UV-brane with positive tension placed in the middle of the interval — IR-UV-IR model. The background solutions for this geometric setup are found without and with taking into account the backreaction of the matter fields. A 5D SU(2) Higgs doublet is employed as the Goldberger-Wise stabilizing field in this geometry and solutions of the 5D coupled scalar-gravity equations are found by using the superpotential method. Within this setup we investigate the low-energy (zero-mode) effective theory for the bulk Standard Model (SM) bosonic sector. The \( {\mathrm{\mathbb{Z}}}_2 \)-even zero-modes correspond to known standard degrees of freedom, whereas the \( {\mathrm{\mathbb{Z}}}_2 \)-odd zero modes might serve as a dark sector. The effective low-energy scalar sector contains a scalar which mimics the SM Higgs boson and a second stable scalar particle (dark-Higgs) is a dark matter candidate; the latter is a component of the zero-mode of the \( {\mathrm{\mathbb{Z}}}_2 \)-odd Higgs doublet. The model that results from the \( {\mathrm{\mathbb{Z}}}_2 \)-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 the 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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Ahmed, A., Grzadkowski, B., Gunion, J.F. et al. Higgs dark matter from a warped extra dimension — the truncated-inert-doublet model. J. High Energ. Phys. 2015, 33 (2015). https://doi.org/10.1007/JHEP10(2015)033
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DOI: https://doi.org/10.1007/JHEP10(2015)033