Higgsed Chromo-Natural Inflation

Peter Adshead, Emil Martinec, Evangelos I. Sfakianakis, Mark Wyman

Research output: Contribution to journalArticlepeer-review


We demonstrate that Chromo-Natural Inflation can be made consistent with observational data if the SU(2) gauge symmetry is spontaneously broken. Working in the Stueckelberg limit, we show that isocurvature is negligible, and the resulting adiabatic fluctuations can match current observational constraints. Observable levels of chirally-polarized gravitational radiation (r ∼ 10−3) can be produced while the evolution of all background fields is sub-Planckian. The gravitational wave spectrum is amplified via linear mixing with the gauge field fluctuations, and its amplitude is not simply set by the Hubble rate during inflation. This allows observable gravitational waves to be produced for an inflationary energy scale below the GUT scale. The tilt of the resulting gravitational wave spectrum can be either blue or red.

Original languageEnglish (US)
Article number137
JournalJournal of High Energy Physics
Issue number12
StatePublished - Dec 1 2016


  • Chern-Simons Theories
  • Cosmology of Theories beyond the SM
  • Spontaneous Symmetry Breaking

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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