• DOI:10.1007/JHEP04(2012)128
• Corpus ID: 119235859

Inflation and dark matter in two Higgs doublet models

@article{Gong2012InflationAD,
  title={Inflation and dark matter in two Higgs doublet models},
  author={Jinn-Ouk Gong and Hyun Min Lee and Sin Kyu Kang},
  journal={Journal of High Energy Physics},
  year={2012},
  volume={2012},
  pages={1-31}
}

• Jinn-Ouk Gong, Hyun Min Lee, S. Kang
• Published 1 February 2012
• Physics
• Journal of High Energy Physics

A bstractWe consider the Higgs inflation in the extension of the Standard Model with two Higgs doublets coupled to gravity non-minimally. In the presence of an approximate global U(1) symmetry in the Higgs sector, both radial and angular modes of neutral Higgs bosons drive inflation where large non-Gaussianity is possible from appropriate initial conditions on the angular mode. We also discuss the case with single-field inflation for which the U(1) symmetry is broken to a Z2 subgroup. We show that inflationary constraints, perturbativity and stability conditions restrict the parameter space of the Higgs quartic couplings at low energy in both multi- and single-field cases. Focusing on the inert doublet models where Z2 symmetry remains unbroken at low energy, we show that the extra neutral Higgs boson can be a dark matter candidate consistent with the inflationary constraints. The doublet dark matter is always heavy in multi-field inflation while it can be light due to the suppression of the co-annihilation in single-field inflation. The implication of the extra quartic couplings on the vacuum stability bound is also discussed in the light of the recent LHC limits on the Higgs mass.