Large Nongaussianity from Nonlocal Inflation

Abstract

We study the possibility of obtaining large nongaussian signatures in the Cosmic Microwave Background in a general class of single-field nonlocal hill-top inflation models. We estimate the nonlinearity parameter f_{NL} which characterizes nongaussianity in such models and show that large nongaussianity is possible. For the recently proposed p-adic inflation model we find that f_{NL} ~ 120 when the string coupling is order unity. We show that large nongaussianity is also possible in a toy model with an action similar to those which arise in string field theory.

27 pages, no figures. Added references and some clarifying remarks

References in corpus (34)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• Observational Signatures and Non-Gaussianities of General Single Field Inflation
• Non-Gaussianities in two-field inflation
• Degravitation of the Cosmological Constant and Graviton Width
• Primordial trispectrum from inflation
• The Inflationary Trispectrum for Models with Large Non-Gaussianities
• Localization of nonlocal theories
• Non-gaussianity from the second-order cosmological perturbation
• Non-Gaussianity from Preheating
• Limits on f_NL parameters from WMAP 3yr data
• Non-perturbative Gravity, Hagedorn Bounce & CMB
• A numerical study of non-gaussianity in the curvaton scenario
• Bouncing and Accelerating Solutions in Nonlocal Stringy Models
• Non-Gaussianity from Instant and Tachyonic Preheating
• Nongaussianity from Tachyonic Preheating in Hybrid Inflation
• DBI Inflation in the Tip Region of a Warped Throat
• Fading Gravity and Self-Inflation
• Seed perturbations for primordial magnetic fields from MSSM flat directions
• Nflation: non-gaussianity in the horizon-crossing approximation
• Non-Gaussian Inflationary Perturbations from the dS/CFT Correspondence
• Primordial Non-Gaussianity and Gravitational Waves: Observational Tests of Brane Inflation in String Theory
• Inflationary Potential Reconstruction for a WMAP Running Power Spectrum
• Stretching the Inflaton Potential with Kinetic Energy
• Non-gaussianity for a Two Component Hybrid Model of Inflation
• Observing the Geometry of Warped Compactification via Cosmic Inflation
• On the relation between p-adic and ordinary strings
• A Consistency Relation for Power Law Inflation in DBI models
• Cosmological constraints on string scale and coupling arising from tachyonic instability
• Level Truncation and Rolling the Tachyon in the Lightcone Basis for Open String Field Theory
• On Some Nonlinear Integral Equation in the (Super)String Theory
• Nonlocal String Tachyon as a Model for Cosmological Dark Energy
• Membrane solutions in M-theory
• Non-Gaussianity and constraints for the variance of perturbations in the curvaton model
• Probing Non-Gaussianity In The Cosmic Microwave Background Anisotropies: One Point Distribution Function

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• The imprints of primordial non-gaussianities on large-scale structure: scale dependent bias and abundance of virialized objects
• Effects of Scale-Dependent Non-Gaussianity on Cosmological Structures
• Enhanced Non-Gaussianity from Excited Initial States
• Dynamics of Nonlocal Cosmology
• Primordial non-Gaussianity: large-scale structure signature in the perturbative bias model
• Localization of nonlocal theories
• Dynamics with Infinitely Many Derivatives: The Initial Value Problem
• Reconstructing the Distortion Function for Nonlocal Cosmology
• Route to nonlocal cosmology
• Non-gaussianity of inflationary field perturbations from the field equation
• Diffusing non-local inflation: Solving the field equations as an initial value problem
• Predictions for Nongaussianity from Nonlocal Inflation
• Stringy Model of Cosmological Dark Energy
• Dynamics and Stability of Light-Like Tachyon Condensation
• Searching for non-Gaussianity in the WMAP data
• Tachyon Mediated Non-Gaussianity
• A new mechanism for non-locality from string theory: UV-IR quantum entanglement and its imprints on the CMB
• Non-standard kinetic term as a natural source of non-Gaussianity
• Primordial non-Gaussianity estimator: the inhomogeneous noise effect
• Exact Solutions in Nonlocal Linear Models
• Features and nongaussianity in the inflationary power spectrum