Gravitational waves detectable in laser interferometers from axion-SU(2) inflation

Tomohiro Fujita, Kaname Imagawa, Kai Murai

研究成果: Article査読


Chromo-natural inflation (CNI) is an inflationary model where an axion coupled with SU(2) gauge fields acts as the inflaton. In CNI, the gauge fields have nonzero vacuum expectation values (VEVs), which results in the enhancement of gravitational waves (GWs). The original CNI is ruled out by the Planck observations due to the overproduction of GWs. In this work, we consider an inflationary model where the gauge fields acquire nonzero VEVs after the CMB modes exit the horizon. Moreover, we add to the model another field that dominates the universe and drives inflation after the axion starts to oscillate and the gauge field VEVs vanish. By performing numerical simulations, we find a parameter space where the enhanced GWs do not violate the CMB constraints and can be detected by the future GWs observations such as BBO and ET.

ジャーナルJournal of Cosmology and Astroparticle Physics
出版ステータスPublished - 2022 7月 1

ASJC Scopus subject areas

  • 天文学と天体物理学


「Gravitational waves detectable in laser interferometers from axion-SU(2) inflation」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。