CAS Key Laboratory of Theoretical Physics

Institute of Theoretical Physics

Chinese Academy of Sciences

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Dark matter in (partially) composite Higgs models

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(Based on arXiv:1808.07515) We construct composite and partially composite Higgs models with complex pseudo-Nambu--Goldstone (pNGB) dark matter states  from four-dimensional gauge-Yukawa theories with strongly interacting fermions. The fermions  are partially gauged under the electroweak symmetry, and the dynamical electroweak  symmetry breaking sector is minimal.  The pNGB dark matter particle is stable  due to a $\mathrm{U}(1)$ technibaryon-like symmetry, also present in the technicolor limit of the models. However, the relic density is particle anti-particle symmetric and due to thermal freeze-out as opposed to the technicolor limit where it is typically due to an asymmetry.  The pNGB Higgs is composite or partially composite depending on the origin of the Standard Model  fermion masses, which impacts the dark matter phenomenology. We illustrate the  important features with a model example invariant under an $\SU(4)\times \SU(2) \times \mathrm{U}(1)$ global symmetry. 

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