Axion-Gauge Field Dynamics with Backreaction
arXiv:2111.14429 · doi:10.1088/1475-7516/2022/03/010
Abstract
Phenomenological success of inflation models with axion and SU(2) gauge fields relies crucially on control of backreaction from particle production. Most of the previous study only demanded the backreaction terms in equations of motion for axion and gauge fields be small on the basis of order-of-magnitude estimation. In this paper, we solve the equations of motion with backreaction for a wide range of parameters of the spectator axion-SU(2) model. First, we find a new slow-roll solution of the axion-SU(2) system in the absence of backreaction. Next, we obtain accurate conditions for stable slow-roll solutions in the presence of backreaction. Finally, we show that the amplitude of primordial gravitational waves sourced by the gauge fields can exceed that of quantum vacuum fluctuations in spacetime by a large factor, without backreaction spoiling slow-roll dynamics. Imposing additional constraints on the power spectra of scalar and tensor modes measured at CMB scales, we find that the sourced contribution can be more than ten times the vacuum one. Imposing further a constraint of scalar modes non-linearly sourced by tensor modes, the two contributions can still be comparable.
arXiv comment30 pages, 20 figures, minor corrections, accepted by JCAP
References in corpus (45)
- Planck 2018 results. X. Constraints on inflation
- Particle Physics Models of Inflation and the Cosmological Density Perturbation
- The Simons Observatory: Science goals and forecasts
- BICEP / Keck XIII: Improved Constraints on Primordial Gravitational Waves using Planck, WMAP, and BICEP/Keck Observations through the 2018 Observing Season
- What would we learn by detecting a gravitational wave signal in the cosmic microwave background anisotropy?
- Gauge Fields and Inflation
- Chromo-Natural Inflation: Natural inflation on a steep potential with classical non-Abelian gauge fields
- Non-Abelian Gauge Field Inflation
- Gauge Fields and Inflation: Chiral Gravitational Waves, Fluctuations and the Lyth Bound
- Primordial Gravitational Waves from Axion-Gauge Fields Dynamics
- Perturbations in Chromo-Natural Inflation
- Stability analysis of chromo-natural inflation and possible evasion of Lyth's bound
- Planck constraints on the tensor-to-scalar ratio
- Finding the chiral gravitational wave background of an axion-SU(2) inflationary model using CMB observations and laser interferometers
- Axion Inflation with an SU(2) Gauge Field: Detectable Chiral Gravity Waves
- Large Tensor Non-Gaussianity from Axion-Gauge Fields Dynamics
- Axion Gauge Field Inflation and Gravitational Leptogenesis: A Lower Bound on B Modes from the Matter-Antimatter Asymmetry of the Universe
- Higgsed Chromo-Natural Inflation
- Measuring the spectrum of primordial gravitational waves with CMB, PTA and Laser Interferometers
- Gauge-field production during axion inflation in the gradient expansion formalism
- Chiral Primordial Gravitational Waves from Dilaton Induced Delayed Chromo-natural Inflation
- Gauge-flation Vs Chromo-Natural Inflation
- Gauge-flation trajectories in Chromo-Natural Inflation
- Tensor Non-Gaussianity from Axion-Gauge-Fields Dynamics : Parameter Search
- Gauge-flation confronted with Planck
- Results from the Wilkinson Microwave Anisotropy Probe
- Clockwork Axions in Cosmology: Is Chromonatural Inflation Chrononatural?
- Chromo-Natural Model in Anisotropic Background
- Non-Gaussianity from Axion-Gauge Fields Interactions during Inflation
- Emerging chromo-natural inflation
- Does the detection of primordial gravitational waves exclude low energy inflation?
- Production and Backreaction of Spin-2 Particles of Gauge Field during Inflation
- Higgsed Gauge-flation
- Nonlinear perturbations from axion-gauge fields dynamics during inflation
- Nonlinear perturbations from the coupling of the inflaton to a non-Abelian gauge field, with a focus on Chromo-Natural Inflation
- Chromo-Natural Inflation in the Axiverse
- Mixed Non-Gaussianity from Axion-Gauge Field Dynamics
- Hypermagnetogenesis from axion inflation: Model-independent estimates
- How attractive is the isotropic attractor solution of axion-SU(2) inflation?
- Massive Gauge-flation
- The isotropic attractor solution of axion-SU(2) inflation: Universal isotropization in Bianchi type-I geometry
- Tensor Spectra Templates for Axion-Gauge Fields Dynamics during Inflation
- Gravitational waves from spectator Gauge-flation
- Gravitational wave trispectrum in the axion-SU(2) model
- Anisotropic Massive Gauge-flation