Chiral primordial blue tensor spectra from the axion-gauge couplings

Abstract

We suggest the new feature of primordial gravitational waves sourced by the axion-gauge couplings, whose forms are motivated by the dimensional reduction of the form field in the string theory. In our inflationary model, as an inflaton we adopt two types of axion, dubbed the model-independent axion and the model-dependent axion, which couple with two gauge groups with different sign combination each other. Due to these forms both polarization modes of gauge fields are amplified and enhance both helicies of tensor modes during inflation. We point out the possibility that a primordial blue-tilted tensor power spectra with small chirality are provided by the combination of these axion-gauge couplings, intriguingly both amplitudes and chirality are potentially testable by future space-based gravitational wave interferometers such as DECIGO and BBO project.

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Cited by in corpus (19)

• Primordial gravitational waves from NANOGrav: a broken power-law approach
• Baryon Asymmetry and Gravitational Waves from Pseudoscalar Inflation
• Propagation of the gravitational waves in a cosmological background
• Implications of Gravitational-wave Production from Dark Photon Resonance to Pulsar-timing Observations and Effective Number of Relativistic Species
• Broken blue-tilted inflationary gravitational waves: a joint analysis of NANOGrav 15-year and BICEP/Keck 2018 data
• Gravitational wave background from non-Abelian reheating after axion-like inflation
• Mixed Non-Gaussianity from Axion-Gauge Field Dynamics
• Statistically Anisotropic Tensor Modes from Inflation
• Footprint of Two-Form Field: Statistical Anisotropy in Primordial Gravitational Waves
• Generating enhanced parity-violating gravitational waves during inflation with violation of the null energy condition
• Generation of Primordial Black Holes and Gravitational Waves from Dilaton-Gauge Field Dynamics
• Dissecting the Stochastic Gravitational Wave Background with Astrometry
• Generating enhanced primordial GWs during inflation with intermittent violation of NEC and diminishment of GW propagating speed
• Parity-violation in bouncing cosmology
• Parity-violating scalar trispectrum from a rolling axion during inflation
• Gravitational wave trispectrum in the axion-SU(2) model
• Universality of linear perturbations in SU($N$)-natural inflation
• Probing Parity Violation in the Stochastic Gravitational Wave Background with Astrometry
• Parity violation in primordial tensor non-Gaussianities from matter bounce cosmology