Primordial non-Gaussianity in noncanonical warm inflation: three- and four-point correlations

Abstract

Non-Gaussianity generated in inflation can be contributed by two parts. The first part, denoted by $f_{NL}^{\delta N}$, is the contribution from four-point correlation of inflaton field which can be calculated using $\delta N$ formalism, and the second part, denoted by $f_{NL}^{int}$, is the contribution from the three-point correlation function of the inflaton field. We consider the two contributions to the non-Gaussianity in noncanonical warm inflation throughout (noncanonical warm inflation is a new inflationary model which is proposed in \cite{Zhang2014}). We find the two contributions are complementary to each other. The four-point correlation contribution to the non-Gaussianity is overwhelmed by the three-point one in strong noncanonical limit, while the conclusion is opposite in the canonical case. We also discuss the influence of the field redefinition, thermal dissipative effect and noncanonical effect to the non-Gaussianity in noncanonical warm inflation.

7 pages. Accepted for publication in Physical Review D

References in corpus (11)

• Observational Signatures and Non-Gaussianities of General Single Field Inflation
• Warm Inflation and its Microphysical Basis
• Effects of Scale-Dependent Non-Gaussianity on Cosmological Structures
• Non-Gaussianities in two-field inflation
• Non-gaussianity from the second-order cosmological perturbation
• The warm inflationary universe
• Theory of non-Gaussianity in warm inflation
• Particle production and reheating in the inflationary universe
• Note on Non-Gaussianities in Two-field Inflation
• A phenomenology analysis of the tachyon warm inflation in loop quantum cosmology
• Primordial non-Gaussianity in noncanonical warm inflation

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