Observational Constraints on Warm Natural Inflation

Abstract

Warm natural inflation is studied for the case of the original cosine potential. The radiation bath during inflation induces a dissipation (friction) rate in the equation of motion for the inflaton field, which can potentially reduce the field excursion needed for an observationally viable period of inflation. We examine if the dissipation thus provides a mechanism to avoid the large decay constant $f\gtrsim M_{\mathrm{pl}}$ of cold cosine natural inflation. Whereas temperature independent dissipation has previously been shown to alleviate the need for a trans-Planckian decay constant $f$, we illustrate here the difficulties of accommodating a significantly sub-Planckian decay constant ($f<10^{-1}{M}_{\mathrm{pl}}$) in the case of the following temperature dependent dissipation rates, $\Gamma \propto T^c$, with $c=\{1,3\}$. Such dissipation rates represent physically well-motivated constructions in the literature. For each model, we map its location in the $r$-$n_s$ plane and compare with Cosmic Microwave Background data. For $c=1(c=3)$, we find that agreement with CMB data requires that dissipation be in the weak (moderate) regime and that the minimum allowed value of the decay constant in the potential is $f_{\min }=0.3(0.8)M_{\mathrm{pl}}$ respectively.

arXiv comment23 pages, 3 figures, 1 table, Replacement due to typo on DOE acknowledgement number

References in corpus (45)

• Planck 2018 results. X. Constraints on inflation
• Planck 2018 results. I. Overview and the cosmological legacy of Planck
• BICEP / Keck XIII: Improved Constraints on Primordial Gravitational Waves using Planck, WMAP, and BICEP/Keck Observations through the 2018 Observing Season
• Monodromy in the CMB: Gravity Waves and String Inflation
• Warm Inflation
• How long before the end of inflation were observable perturbations produced?
• Completing Natural Inflation
• Thermally Induced Density Perturbations in the Inflation Era
• On the Possibility of Large Axion Decay Constants
• Scalar perturbation spectra from warm inflation
• Interpolating the Stage of Exponential Expansion in the Early Universe: a possible alternative with no reheating
• The hot baryon violation rate is $O({\alpha }_W^5{T}^4)$
• Warm Little Inflaton
• Perturbation Spectra in the Warm Inflationary Scenario
• Scale-dependent gravitational waves from a rolling axion
• The Sphaleron Rate in SU(N) Gauge Theory
• Power spectrum for inflation models with quantum and thermal noises
• Warm inflation as a way out of the swampland
• On Axion Thermalization in the Early Universe
• Density fluctuations from warm inflation
• Shear viscous effects on the primordial power spectrum from warm inflation
• Thermal axion production in the primordial quark-gluon plasma
• Warm inflation dissipative effects: predictions and constraints from the Planck data
• Minimal Warm Inflation
• Rolling axions during inflation: perturbativity and signatures
• On the consistency of warm inflation
• Cosmological fluctuations of a random field and radiation fluid
• On: Natural Inflation
• Natural Inflation: Consistency with Cosmic Microwave Background Observations of Planck and BICEP2
• Enhanced polarization of CMB from thermal gravitational waves
• Natural Warm Inflation
• Determining the regimes of cold and warm inflation in the susy hybrid model
• Dark Energy Radiation
• Runaway potentials in warm inflation satisfying the swampland conjectures
• Warm natural inflation
• Observational Constraints on Monomial Warm Inflation
• Primordial Black-Hole Dark Matter via Warm Natural Inflation
• Warming up cold inflation
• Cosmological perturbations for an inflaton field coupled to radiation
• Gravitational wave background from vacuum and thermal fluctuations during axion-like inflation
• Evolution of the Primordial Axial Charge across Cosmic Times
• Identifying Universality in Warm Inflation
• Warm-assisted natural inflation
• Shape of the hot topological charge density spectral function
• Constraints on the scalar-field potential in warm inflation

Cited by in corpus (20)

• Inflationary interpretation of the stochastic gravitational wave background signal detected by pulsar timing array experiments
• The warm inflation story
• WarmSPy: a numerical study of cosmological perturbations in warm inflation
• Running and running of the running of the scalar spectral index in warm inflation
• Testing scale-invariant inflation against cosmological data
• Natural Inflation with Exponentially Small Tensor-To-Scalar Ratio
• Perturbation Spectra of Warm Inflation in $f(Q,T)$ Gravity
• A comparative analysis of dissipation coefficients in warm inflation
• Dark Matter Freeze-In during Warm Inflation and the Seesaw Mechanism
• Warm multi natural inflation
• Trans-Planckian censorship constraints on properties and cosmological applications of axion-like fields
• Gravitational waves from two scalar fields unifying the dark sector with inflation
• Purely gravitational dark matter production in warm inflation
• Thermal effects on warm chromoinflation
• Defying eternal inflation in warm inflation with a negative running
• Sustaining quasi de-Sitter inflation with bulk viscosity
• Is natural inflation in agreement with CMB data?
• Universe bouncing its way to inflation
• Gravitational waves from warm inflation in the weak dissipative regime
• Scalaron-driven Dark Matter during Warm Inflation via UV Freeze--in