Trans-Planckian Effects in Warm Inflation

Abstract

We study the effect of a non-trivial vacuum prescription on warm inflation observables, namely the power spectrum of the comoving curvature perturbation. Non-trivial choice of vacuum, can provide information about trans-Planckian physics. Traditionally, the initial condition for inflation is chosen to be the usual Bunch-Davies vacuum. Another more reasonable choice of vacuum is the so-called $\alpha$-vacua. Because the duration of inflation is not infinite, as it is assumed in the Bunch-Davies case, imposing the initial condition at infinite past is not sensible and one must utilize another vacuum prescription. In this paper, working in the slow-roll regime during warm inflation, the initial condition for inflaton fluctuations is imposed at finite past, i.e. the $\alpha$-vacua. We show that this non-trivial vacuum prescription results in oscillatory correction to the comoving curvature power spectrum, which is scale dependent both in amplitude and frequency. Having obtained this scale dependent power spectrum, we consider its late time footprints and compare our results with observational data and other proposed models for the comoving curvature power spectrum.

arXiv comment29 pages, 5 figures

References in corpus (36)

• MultiNest: an efficient and robust Bayesian inference tool for cosmology and particle physics
• The Cosmic Linear Anisotropy Solving System (CLASS) II: Approximation schemes
• Inflation Dynamics and Reheating
• Monodromy in the CMB: Gravity Waves and String Inflation
• Conservative Constraints on Early Cosmology: an illustration of the Monte Python cosmological parameter inference code
• Gravity Waves and Linear Inflation from Axion Monodromy
• Warm Inflation
• The Trans-Planckian Problem of Inflationary Cosmology
• A note on inflation and transplanckian physics
• Thermally Induced Density Perturbations in the Inflation Era
• The Robustness of Inflation to Changes in Super-Planck-Scale Physics
• Scalar perturbation spectra from warm inflation
• Warm Inflation in the Adiabatic Regime- a Model, an Existence Proof for Inflationary Dynamics in Quantum Field Theory
• Signatures of Short Distance Physics in the Cosmic Microwave Background
• Microphysical Approach to Nonequilibrium Dynamics of Quantum Fields
• Inflation with a Planck-scale frequency cutoff
• Interpolating the Stage of Exponential Expansion in the Early Universe: a possible alternative with no reheating
• Thermal Properties of an Inflationary Universe
• Perturbation Spectra in the Warm Inflationary Scenario
• Trans-Planckian Issues for Inflationary Cosmology
• Power spectrum for inflation models with quantum and thermal noises
• Are Inflationary Predictions Sensitive to Very High Energy Physics?
• Cosmological Perturbations from a New-Physics Hypersurface
• Effective Field Theories and Inflation
• Searching for Oscillations in the Primordial Power Spectrum: Constraints from Planck (Paper II)
• Squeezed Thermal Vacuum and the Maximum Scale for Inflation
• The warm inflationary universe
• Temperature of the inflaton and duration of inflation from WMAP data
• A Consistency Relation for Single-Field Inflation with Power Spectrum Oscillations
• Primordial Spikes from Wrapped Brane Inflation
• Power spectra in warm G-inflation and its consistency: stochastic approach
• G-Warm inflation
• Evolution of the curvature perturbations during warm inflation
• Density Perturbations of Thermal Origin During Inflation
• The Effect of $\alpha$-Vacua on the Scalar and Tensor Spectral Indices: Slow-Roll Approximation
• Temperature effect on the power spectrum in inflation

Cited by in corpus (3)

• A paradigm of warm quintessential inflation and production of relic gravity waves
• Role of trans-Planckian modes in cosmology
• The Role of Torsion in Trans-Planckian Physics