Twin Cogenesis

TL;DR

This paper proposes a twin cogenesis mechanism within twin Higgs models that simultaneously explains dark matter, neutrino masses, and matter-antimatter asymmetry without explicit Z2 breaking, using heavy Majorana neutrinos and a dark photon.

Contribution

It introduces a novel twin cogenesis mechanism applicable to various twin Higgs models, avoiding Z2 breaking and satisfying cosmological constraints.

Findings

Dark matter candidates are twin baryons with ~5.5 GeV mass.

The mechanism naturally explains the comparable amounts of dark and visible matter.

Twin cogenesis successfully generates lepton and twin lepton asymmetries.

Abstract

We investigate a cogenesis mechanism 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. The twin cogenesis mechanism applies to any viable twin Higgs model without an explicit $\mathbb{Z}_2$ breaking in the leptonic sector and evading the $\Delta N_{\rm eff}$ constraint. We illustrate the twin cogenesis mechanism using the neutrino-philic twin two Higgs doublet model, a newly proposed model to lift the twin neutrino masses with spontaneous $\mathbb{Z}_2$ breaking. The dark photon with a Stueckelberg mass $\mathcal{O}(10)$ MeV 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 candidates with masses approximately 5.5 GeV, which explain naturally the amount of dark matter and visible matter in the Universe are of the same order. We also demonstrate twin cogenesis in the fraternal twin Higgs setup, in which the dark matter candidate is the twin bottom bound state $\Omega^\prime_{b^\prime b^\prime b^\prime}$.