General Single Field Inflation with Large Positive Non-Gaussianity

Abstract

Recent analysis of the WMAP three year data suggests $f_{NL}^{local}\simeq 86.8$ in the WMAP convention. It is necessary to make sure whether general single field inflation can produce a large positive $f_{NL}$ before turning to other scenarios. We give some examples to generate a large positive $f_{NL}^{equil}$ in general single field inflation. Our models are different from ghost inflation. Due to the appearance of non-conventional kinetic terms, $f_{NL}^{equil}\gg 1$ can be realized in single field inflation.

27 pages, 3 figure; final version published in JCAP

References in corpus (5)

• Detection of primordial non-Gaussianity (fNL) in the WMAP 3-year data at above 99.5% confidence
• Seed perturbations for primordial magnetic fields from MSSM flat directions
• The Pursuit of Non-Gaussian Fluctuations in the Cosmic Microwave Background
• Constraints on the spectral index for the inflation models in string landscape
• Testing models of inflation with CMB non-gaussianity

Cited by in corpus (13)

• Primordial Non-Gaussianities of General Multiple Field Inflation
• Curvaton Dynamics and the Non-Linearity Parameters in Curvaton Model
• Large Non-Gaussianity Implication for Curvaton Scenario
• Reconstructing a general inflationary action
• $\alpha$-vacuum and inflationary bispectrum
• The Trispectrum in the Multi-brid Inflation
• N-vaton
• Consistency Relations for Non-Gaussianity
• Spectral Index in Curvaton Scenario
• Revisiting non-Gaussianity of multiple-field inflation from the field equation
• Reconstructing Single Field Inflationary Actions From CMBR Data
• Thermal non-Gaussianity in holographic cosmology
• Reconstruction of the isocurvaton scenario