Effects of particle production during inflation

Abstract

The impact of particle production during inflation on the primordial curvature perturbation spectrum is investigated both analytically and numerically. We obtain an oscillatory behavior on small scales, while on large scales the spectrum is unaffected. The amplitude of the oscillations is proportional to the number of coupled fields, their mass, and the square of the coupling constant. The oscillations are due a discontinuity in the second time derivative of the inflaton, arising from a temporary violation of the slow-roll conditions. A similar effect on the power spectrum should be produced also in other inflationary models where the slow-roll conditions are temporarily violated.

7 pages, 5 figures

References in corpus (10)

• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• Inflationary perturbations from a potential with a step
• Probing Planckian physics: resonant production of particles during inflation and features in the primordial power spectrum
• Enhancement of superhorizon scale inflationary curvature perturbations
• New Universal Local Feature in the Inflationary Perturbation Spectrum
• The CMB Quadrupole depression produced by early fast-roll inflation: MCMC analysis of WMAP and SDSS data
• CMB quadrupole suppression: II. The early fast roll stage
• Breaking scale invariance from a singular inflaton potential
• Observational constraints on particle production during inflation

Cited by in corpus (69)

• Features of heavy physics in the CMB power spectrum
• Gravity waves and non-Gaussian features from particle production in a sector gravitationally coupled to the inflaton
• On the importance of heavy fields during inflation
• Inflation, Cosmic Perturbations and Non-Gaussianities
• Trapped Inflation
• Particle Production During Inflation: Observational Constraints and Signatures
• Cosmological Fluctuations from Infra-Red Cascading During Inflation
• On Classification of Models of Large Local-Type Non-Gaussianity
• On Features and Nongaussianity from Inflationary Particle Production
• Reconstruction of the Primordial Power Spectrum using Temperature and Polarisation Data from Multiple Experiments
• The Future of Primordial Features with Large-Scale Structure Surveys
• The Effective Field Theory of Inflation Models with Sharp Features
• Reconstruction of the primordial power spectrum of curvature perturbations using multiple data sets
• Large and strong scale dependent bispectrum in single field inflation from a sharp feature in the mass
• Numerical evaluation of the bispectrum in multiple field inflation
• Reconstruction of the Primordial Power Spectrum by Direct Inversion
• Primordial perturbations and non-Gaussianities from modulated trapping
• Nongaussianity from Particle Production During Inflation
• Untangling features in the primordial spectra
• Sudden variations in the speed of sound during inflation: features in the power spectrum and bispectrum
• Cosmic inflation in a landscape of heavy-fields
• Resonant Signatures of Heavy Scalar Fields in the Cosmic Microwave Background
• Irruption of massive particle species during inflation
• Constraints on inflation with LSS surveys: features in the primordial power spectrum
• Effects of discontinuities of the derivatives of the inflaton potential
• Beauty is Distractive: Particle production during multifield inflation
• The Hubble Effective Potential
• Localized Features in Non-Gaussianity from Heavy Physics
• Consistency relations for sharp features in the primordial spectra
• Fluid Inflation
• New constraints on primordial features from the galaxy two-point correlation function
• Brane Annihilations during Inflation
• Resonant particle production during inflation: a full analytical study
• A Multiple Step-like Spectrum of Primordial Perturbation
• Primordial Spikes from Wrapped Brane Inflation
• Multiple Inflationary Stages with Varying Equation of State
• Local Features with Large Spiky non-Gaussianities during Inflation
• D-brane Bremsstrahlung
• The phenomenology of trapped inflation
• Fields Annihilation and Particles Creation in DBI inflation
• Primordial Power Spectrum features and $f_{NL}$ constraints
• PRISM: Sparse Recovery of the Primordial Power Spectrum
• Superadiabatic basis in cosmological particle production: application to preheating
• Fine Features in the Primordial Power Spectrum
• The MESS of cosmological perturbations
• Primordial feature constraints from BOSS+eBOSS
• Effects of local features of the inflaton potential on the spectrum and bispectrum of primordial perturbations
• Multi-Stream Inflation in a Landscape
• Cosmological Particle Production and Pairwise Hotspots on the CMB
• Explaining low l anomalies in the CMB power spectrum with resonant superstring excitations during inflation
• Possible Evidence for Planck-Scale Resonant Particle Production during Inflation from the CMB Power Spectrum
• Enhanced Preheating after Multi-Field Inflation: On the Importance of being Special
• Particle Production during Inflation in Light of PLANCK
• Jump in fluid properties of inflationary universe to reconcile scalar and tensor spectra
• Particle production during Inflation with a non-minimally coupled spectator scalar field
• Improving Constraints on Inflation with CMB Delensing
• Enhanced spectrum of primordial perturbations, galaxy formation and small scale structure
• Probing the Primordial Power Spectrum with Cluster Number Counts
• Detecting the dark sector through scalar-induced gravitational waves
• Implications for Pulsar Timing Arrays of Sub-solar Black Hole Detections: From LVK to Einstein Telescope and Cosmic Explorer
• One spectrum to rule them all?
• No slow-roll inflation à la Generalized Chaplygin Gas in General Relativity
• Degeneracy in the spectrum and bispectrum among featured inflaton potentials
• Trapping effects in inflation: blue spectrum at small scales
• Effects of Variable Newton Constant During Inflation
• Cherenkov in the Sky: Measuring the Sound Speed of Primordial Scalar Fluctuations
• Non-perturbative approach for scalar particle production in Higgs-$R^2$ inflation
• Non-equilibrium evolution of quantum fields during inflation and late accelerating expansion
• Investigating the Constraints on Primordial Features with Future Cosmic Microwave Background and Galaxy Surveys