On Non-Gaussianities in Two-Field Poly-Instanton Inflation

Abstract

In the context of Type IIB LARGE volume orientifold setup equipped with poly-instanton corrections, the standard single-field poly-instanton inflation driven by a 'Wilson' divisor volume modulus is generalized by the inclusion of respective axion modulus. This two-field dynamics results in a "Roulette" type inflation with the presence of several inflationary trajectories which could produce 50 (or more) e-foldings. The evolution of various trajectories along with physical observables are studied. The possibility of generating primordial non-Gaussianities in the slow-roll as well as in the beyond slow-roll region is investigated. We find that although the non- linearity parameters are quite small during the slow-roll regime, the same are significantly enhanced in the beyond slow-roll regime investigated up to the end of inflation.

37 pages, 6 figures, arXiv admin note: text overlap with arXiv:1208.1160 in review section 2, References and Table.2 added, Typos fixed, published version

References in corpus (20)

• Four-dimensional String Compactifications with D-Branes, Orientifolds and Fluxes
• Non-Gaussianities in two-field inflation
• Detection of primordial non-Gaussianity (fNL) in the WMAP 3-year data at above 99.5% confidence
• Volume Modulus Inflation and the Gravitino Mass Problem
• Primordial Non-Gaussianity in Multi-Scalar Slow-Roll Inflation
• On the Issue of the ζSeries Convergence and Loop Corrections in the Generation of Observable Primordial Non-Gaussianity in Slow-Roll Inflation. Part I: the Bispectrum
• On Classification of Models of Large Local-Type Non-Gaussianity
• Reheating for Closed String Inflation
• Power Towers of String Instantons for N=1 Vacua
• Non-standard primordial fluctuations and nongaussianity in string inflation
• Higher order contributions to the primordial non-gaussianity
• Moduli Stabilization, Large-Volume dS Minimum Without anti-D3-Branes, (Non-)Supersymmetric Black Hole Attractors and Two-Parameter Swiss Cheese Calabi-Yau's
• Large Volume Axionic Swiss-Cheese Inflation
• Wilson Line Inflation
• A Note on Poly-Instanton Effects in Type IIB Orientifolds on Calabi-Yau Threefolds
• Reheating, Multifield Inflation and the Fate of the Primordial Observables
• Moduli Stabilization and Inflationary Cosmology with Poly-Instantons in Type IIB Orientifolds
• Separable and non-separable multi-field inflation and large non-Gaussianity
• Axionic D3-D7 Inflation
• The Non-Gaussianity of Racetrack Inflation Models