Primordial perturbations and non-Gaussianities from modulated trapping

Abstract

We propose a new mechanism to generate primordial curvature perturbations, based on the resonant production of particles during inflation. It is known that this phenomenon can trap the inflaton for a fraction of e-fold. This effect is governed by the mass of the produced particles and by their coupling to the inflaton, parameters which can depend on the expectation value of other fields. If one of such additional fields - a 'modulaton' - is light, then its fluctuations, acquired during the earlier stages of inflation, will induce a spatial modulation of the trapping, and thus of the end of inflation, corresponding to a curvature perturbation. We calculate the power spectrum, bispectrum and trispectrum of the curvature perturbations generated by this mechanism, taking into account the perturbations due to the inflaton fluctuations as well. We find that modulated trapping could provide the main contribution to the observed power spectrum and lead to detectable primordial non-gaussianities.

16 pages, 2 figures

References in corpus (31)

• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Towards the Theory of Reheating After Inflation
• Three Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Polarization Analysis
• Generating the curvature perturbation without an inflaton
• A General Analytic Formula for the Spectral Index of the Density Perturbations produced during Inflation
• Adiabatic CMB perturbations in pre-big bang string cosmology
• Effects of Cosmological Moduli Fields on Cosmic Microwave Background
• A general proof of the conservation of the curvature perturbation
• The inflationary prediction for primordial non-gaussianity
• A new mechanism for generating density perturbations from inflation
• Super-Horizon Scale Dynamics of Multi-Scalar Inflation
• Beauty is Attractive: Moduli Trapping at Enhanced Symmetry Points
• Probing Planckian physics: resonant production of particles during inflation and features in the primordial power spectrum
• Primordial trispectrum from inflation
• Multiple inflation
• Optimal limits on f_{NL}^{local} from WMAP 5-year data
• Primordial Curvature Fluctuation and Its Non-Gaussianity in Models with Modulated Reheating
• Probing String Theory with Modulated Cosmological Fluctuations
• Non-Gaussianity, Spectral Index and Tensor Modes in Mixed Inflaton and Curvaton Models
• Trapped Inflation
• Evolution of non-linear cosmological perturbations
• Conserved non-linear quantities in cosmology
• Mixed inflaton and curvaton perturbations
• Cosmological Fluctuations from Infra-Red Cascading During Inflation
• Multiple Inflation, Cosmic String Networks and the String Landscape
• Effects of particle production during inflation
• Preheating and the non-gaussianity of the curvature perturbation
• Observational constraints on particle production during inflation
• Cosmological perturbations from inhomogeneous preheating and multi-field trapping
• From heaviness to lightness during inflation

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• Review of local non-Gaussianity from multi-field inflation
• Scale-dependent non-Gaussianity probes inflationary physics
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• Particle Production During Inflation: Observational Constraints and Signatures
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• Large non-Gaussianities in the Effective Field Theory Approach to Single-Field Inflation: the Trispectrum
• On Features and Nongaussianity from Inflationary Particle Production
• Nongaussianity from Particle Production During Inflation
• Non-Gaussianity of scalar perturbations generated by conformal mechanisms
• Quantum aspects of chaos and complexity from bouncing cosmology: A study with two-mode single field squeezed state formalism
• General treatment of isocurvature perturbations and non-Gaussianities
• Isocurvature modes in the CMB bispectrum
• Beauty is Distractive: Particle production during multifield inflation
• The next non-Gaussianity frontier: what can a measurement with $\sigma (f_{\mathrm{NL}})\lesssim 1$ tell us about multifield inflation?
• Large-scale anomalies from primordial dissipation
• Curvature Perturbations from a Massive Vector Curvaton
• Density Perturbations from Modulated Decay of the Curvaton
• Resonant particle production during inflation: a full analytical study
• A Multiple Step-like Spectrum of Primordial Perturbation
• Anatomy of bispectra in general single-field inflation -- modal expansions
• Primordial Trispectrum from Isocurvature Fluctuations
• Elementary Theorems Regarding Blue Isocurvature Perturbations
• The phenomenology of trapped inflation
• Tilt and Running of Cosmological Observables in Generalized Single-Field Inflation
• Fermionic Isocurvature Perturbations
• Implications of Planck results for models with local type non-Gaussianity
• Spectator field models in light of spectral index after Planck
• Quadratic Isocurvature Cross-Correlation, Ward Identity, and Dark Matter
• Enhanced Preheating after Multi-Field Inflation: On the Importance of being Special
• A Universal Bound on Excitations of Heavy Fields during Inflation
• Particle Production during Inflation in Light of PLANCK
• Affleck-Dine baryogenesis with modulated reheating
• Curvature perturbation from velocity modulation
• Effective Field Theory for Inflation
• Hidden in the background: a local approach to CMB anomalies
• Non-perturbative approach for scalar particle production in Higgs-$R^2$ inflation
• Non-Gaussianity in Cosmology: from Inflation to the CMB