Inflation and dark matter in two Higgs doublet models

Jinn Ouk Gong, Hyun Min Lee, Sin Kyu Kang

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

We 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 Z 2 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 Z 2 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.

Original languageEnglish
Article number128
JournalJournal of High Energy Physics
Volume2012
Issue number4
DOIs
StatePublished - 2012

Keywords

  • Beyond standard model
  • Cosmology of theories beyond the SM
  • Higgs physics

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