Cosmology in Mirror Twin Higgs and neutrino masses

Abstract

We explore a simple solution to the cosmological challenges of the original Mirror Twin Higgs (MTH) model that leads to interesting implications for experiment. We consider theories in which both the standard model and mirror neutrinos acquire masses through the familiar seesaw mechanism, but with a low right-handed neutrino mass scale of order a few GeV. In these νMTH models, the right-handed neutrinos leave the thermal bath while still relativistic. As the universe expands, these particles eventually become nonrelativistic, and come to dominate the energy density of the universe before decaying. Decays to standard model states are preferred, with the result that the visible sector is left at a higher temperature than the twin sector. Consequently the contribution of the twin sector to the radiation density in the early universe is suppressed, allowing the current bounds on this scenario to be satisfied. However, the energy density in twin radiation remains large enough to be discovered in future cosmic microwave background experiments. In addition, the twin neutrinos are significantly heavier than their standard model counterparts, resulting in a sizable contribution to the overall mass density in neutrinos that can be detected in upcoming experiments designed to probe the large scale structure of the universe.

Supersymmetric D-term Twin Higgs

“…See, however, refs. [17,18]. For other studies of cosmological implications of Twin Higgs models see e.g.…”

Viable twin cosmology from neutrino mixing

“…Recently, several solutions have been proposed for the cosmological problems of the Twin Higgs, including the Fraternal Twin Higgs (FTH) [10], hard Z 2 -breaking in the Yukawa couplings [11], and SM reheating from a light right-handed neutrino [12]. Further cosmological aspects of Twin Higgs models, including dark matter, have been studied in [11][12][13][14][15][16][17][18][19].…”

“…Further cosmological aspects of Twin Higgs models, including dark matter, have been studied in [11][12][13][14][15][16][17][18][19].…”

“…At this point the twin and SM sectors have similar energy densities, and the twin photon and neutrinos contribute significantly to the radiation density at late times. In particular, the Mirror Twin Higgs (MTH) model-the scenario where the mirror sector is a full copy of the SM-predicts an exceedingly large contribution to the correction of the total radiation density (usually expressed in terms of ∆N eff , as measured from Big Bang Nucleosynthesis (BBN) and the Cosmic Microwave Background (CMB)).Recently, several solutions have been proposed for the cosmological problems of the Twin Higgs, including the Fraternal Twin Higgs (FTH) [10], hard Z 2 -breaking in the Yukawa couplings [11], and SM reheating from a light right-handed neutrino [12]. Further cosmological aspects of Twin Higgs models, including dark matter, have been studied in [11][12][13][14][15][16][17][18][19].…”

Minimal non-abelian supersymmetric Twin Higgs

“…In the scenario, the Higgs is a pseudo-Nambu-Goldstone boson of a global SU(4) symmetry emerging from Z 2 symmetry exchanging the SM with its mirror (or twin) copy. We refer to [16][17][18][19][20][21][22][23] for composite Twin Higgs models, and [24][25][26][27][28][29][30][31][32][33][34] for cosmological aspects of Twin Higgs scenario.…”