http://arxiv.org/abs/2005.06471
We investigate a cogenesis scenario within the twin Higgs setup which can naturally explain the nature of dark matter, the cosmic coincidence puzzle, little hierarchy problem, leptogenesis and the tiny neutrino masses. Three heavy Majorana neutrinos are introduced to the standard model sector and the twin sector respectively, which explain the tiny neutrino masses and generate the lepton asymmetry and the twin lepton asymmetry at the same time. This twin cogenesis scenario is general and applies to any viable twin Higgs model without hard $\mathbb{Z}2$ breaking and evading the $\Delta N{\rm eff}$ constraint. We demonstrate twin cogenesis in two models: fraternal twin Higgs model, and neutrino-philic twin two Higgs doublet model, a newly proposed model to lift the twin neutrino masses with spontaneous $\mathbb{Z}_2$ breaking. The MeV scale dark photon ensures the energy in the twin sector as well as the symmetric component of twin sector particles can be depleted. The lightest twin baryons are the dark matter candidate with masses approximately $5.5$ GeV, which explain naturally the amount of dark matter and the visible matter in the Universe are of the same order.
W. Feng and J. Yu
Fri, 15 May 20
30/65
Comments: 28 pages, 1 figure
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