Primordial Fluctuations from Inflation with a Triad of Background Gauge Fields

Details Primordial Fluctuations from Inflation with a Triad of Background Gauge Fields Primordial Fluctuations from Inflation with a Triad of Background Gauge Fields

2012-03-05

arxiv.org/abs/1203.1071v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Errors corrected, references added

Scientific paper

We study the linear perturbation of the recently proposed model of inflation where a uniform gauge-kinetic coupling of the inflaton to multiple vector fields breaks the cosmic no-hair conjecture while maintaining the isotropy. We derive the general quadratic action for the perturbation and calculate the power spectra of scalar and tensor modes at the end of inflation by in-in formalism. It is shown that the model predicts slightly red spectra and the tensor-to-scalar ratio tends to be suppressed. The comparison with the data from WMAP 7-year does not impose strong constraints on the parameters and both weak- and strong- gauge-field regimes are consistent with the current observations.

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