Pure chromo-natural inflation unavoidably transitions from weak to strong backreaction, producing a chiral three-peak gravitational wave spectrum and a scalar peak that can form primordial black holes.
Dark Radiation in Spectator Axion-Gauge Models
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In the framework of axion-gauge fields models, primordial gravitational wave perturbations could be generated during the inflationary epoch from not only the quantum fluctuation of gravitons but also the dynamics of hidden gauge fields coupled with an axion field. We investigate the evolution of the axion and the gauge field of an additional hidden SU(2) gauge group and those energy densities during and after the inflation. We show that the extra radiation component of the hidden gauge bosons produced by the axion decay can be sizable in the cases where the gauge fields sourced additional gravitational waves is subdominant. We point out that future measurements of the dark radiation energy, such as CMB-S4, can impose significant constraints on this cosmological scenario.
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Pure Chromo-Natural Inflation: Signatures of Particle Production from Weak to Strong Backreaction
Pure chromo-natural inflation unavoidably transitions from weak to strong backreaction, producing a chiral three-peak gravitational wave spectrum and a scalar peak that can form primordial black holes.