Primordial non-Gaussianity in noncanonical warm inflation

Abstract

We study the bispectrum of the primordial curvature perturbation on uniform-density hypersurfaces generated by a kind of the noncanonical warm inflation, wherein the inflation is provided by a noncanonical scalar inflaton field that is coupled to radiation through a thermal dissipation effect. We obtain an analytic form for the nonlinear parameter $f_{NL}$ that describes the non-Gaussianity in first-order cosmological perturbation theory and analyse the magnitude of this nonlinear parameter. We make a comparison between our result and those of the standard inflation and the canonical warm inflation. We also discuss when the contribution to the non-Gaussianity due to the second-order perturbation theory becomes more important and what effect can be observed. We take the Dirac-Born-Infeld (DBI) inflation as a concrete example to find how the sound speed and the thermal dissipation strength to decide the non-Gaussianity and to get a lower bound of the sound speed constrained by PLANCK.

arXiv comment7 pages, 2 figures

References in corpus (65)

• de Sitter Vacua in String Theory
• Hierarchies from Fluxes in String Compactifications
• k-Inflation
• Towards Inflation in String Theory
• Perturbations in k-inflation
• DBI in the Sky
• Acoustic Signatures in the Primary Microwave Background Bispectrum
• Inflation Dynamics and Reheating
• Observational Signatures and Non-Gaussianities of General Single Field Inflation
• Brane Inflation
• Scalar Speed Limits and Cosmology: Acceleration from D-cceleration
• Warm Inflation
• The inflationary prediction for primordial non-gaussianity
• The Inflationary Brane-Antibrane Universe
• Supersymmetry Breaking in the Early Universe
• The Three--Point Correlation Function of the Cosmic Microwave Background in Inflationary Models
• Planck 2013 Results. XXIV. Constraints on primordial non-Gaussianity
• Thermally Induced Density Perturbations in the Inflation Era
• Warm Inflation and its Microphysical Basis
• Scalar perturbation spectra from warm inflation
• Effects of Scale-Dependent Non-Gaussianity on Cosmological Structures
• On non-gaussianities in single-field inflation
• Non-Gaussianities in two-field inflation
• Warm Inflation in the Adiabatic Regime- a Model, an Existence Proof for Inflationary Dynamics in Quantum Field Theory
• Microphysical Approach to Nonequilibrium Dynamics of Quantum Fields
• Running Non-Gaussianities in DBI Inflation
• Quantum Fluctuations, Decoherence of the Mean Field, and Structure Formation in the Early Universe
• Perturbation Spectra in the Warm Inflationary Scenario
• The importance of being warm (during inflation)
• Dissipation coefficients from scalar and fermion quantum field interactions
• Evolution of second-order cosmological perturbations
• Warped Compactifications in M and F Theory
• General dissipation coefficient in low-temperature warm inflation
• Conserved cosmological perturbations
• Non-Gaussianities in Multi-field Inflation
• Evidence for non-Gaussianity in the COBE DMR Four Year Sky Maps
• Non-gaussianity from the second-order cosmological perturbation
• Enhancing the tensor-to-scalar ratio in simple inflation
• Density fluctuations from warm inflation
• Estimating non-gaussianity in the microwave background
• Higher-Order Gravitational Perturbations of the Cosmic Microwave Background
• Non-gaussianity in fluctuations from warm inflation
• Gauge-Invariant Temperature Anisotropies and Primordial Non-Gaussianity
• Non-Gaussian Signatures in the Cosmic Background Radiation from Warm Inflation
• Refining inflation using non-canonical scalars
• On the consistency of warm inflation
• Supersymmetric D-term Inflation, Reheating and Affleck-Dine Baryogenesis
• Tachyon warm inflationary universe models
• The warm inflationary universe
• Theory of non-Gaussianity in warm inflation
• Warm DBI Inflation
• Reconstructing a general inflationary action
• A Bound Concerning Primordial Non-Gaussianity
• On the consistency of warm inflation in the presence of viscosity
• Attractive Lagrangians for Noncanonical Inflation
• The Trispectrum of the 4 Year COBE-DMR data
• Warming up brane-antibrane inflation
• Warm inflation in loop quantum cosmology: a model with a general dissipative coefficient
• Extension of warm inflation to noncanonical scalar fields
• Dynamics and Non-Gaussianity in the Weak-Dissipative Warm Inflation Scenario
• Non-canonical generalizations of slow-roll inflation models
• Note on Non-Gaussianities in Two-field Inflation
• Consistency of the tachyon warm inflationary universe models
• Relations between canonical and non-canonical inflation
• The Degeneracy Problem in Non-Canonical Inflation

Cited by in corpus (12)

• The warm inflation story
• Warm DBI inflation with constant sound speed
• Dirac-Born-Infeld warm inflation realization in the strong dissipation regime
• Primordial non-Gaussianity in warm inflation using $\delta N$ formalism
• Gravitational wave from warm inflation
• Warm inflation with non-comoving scalar field and radiation fluid
• Observational Constraints on Two-field Warm Inflation
• Consistency of a kind of general noncanonical warm inflation
• Non-Gaussianity in a general kind noncanonical warm inflation
• Primordial non-Gaussianity in noncanonical warm inflation: three- and four-point correlations
• Eckart heat-flux applicability in $F(\Phi ,X)R$ theories and the existence of temperature gradients
• Primordial non-Gaussianity in noncanonical warm inflation with nonminimal derivative coupling