Twin cogenesis

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 symmetry 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 $\Omega^\prime_{b^\prime b^\prime b^\prime}$.

Bridging the μHz gap in the gravitational-wave landscape: unveiling dark baryons

“…This similarity in mass densities also implies that the DM and VM particles may have comparable masses of O(GeV). Thus, we outline three approaches that account for this, including mirror symmetry [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][22][23][24][25], convergence of running gauge couplings towards infrared fixed points [26] and the concept of dark unification [27]. We emphasize that these mechanisms, in general, predict the existence of new TeV-mass particles.…”

“…Firstly, we consider models involving the introduction of a mirror symmetry between the visible and dark gauge groups, commonly referred to as mirror matter models. In these models, this symmetry is either preserved [5][6][7][8][9] or deliberately broken [10][11][12][13][14][15][16][17][18][19][20][21], such as Twin Higgs models [22][23][24][25] that address the so-called little hierarchy problem. Secondly, we entertain the possibility that an extension of the field content can result in the convergence of the gauge couplings towards infrared fixed points.…”

“…(i) Introduction of a symmetry between the gauge groups often gives rise to intriguing models of mirror matter, wherein the mirror symmetry is either preserved [5][6][7][8][9] or deliberately broken in a well-considered manner [10][11][12][13][14][15][16][17][18][19][20]. Twin Higgs models serve as a notable illustration of such scenarios [22][23][24][25].…”

Numerical calculation of N-periodic wave solutions of the negative-order Korteweg-de Vries equations

“…For example, the periodic wave solutions of the KdV equation were constructed by Novikov and Dubrovin [54][55][56], Lax [57], Its and Matveev [58], McKean and van Moerbeke [59]. Until now, there have been many studies of KdV-type equations [60][61][62]. The main key in all the work abovementioned paper is to solve with the hierarchy of positiveorder KdV equation.…”