Non-Gaussianity in KKLMMT model

TL;DR

This paper examines the non-Gaussian features of brane inflation within the generalized KKLMMT model, deriving constraints on string coupling and scale based on observational non-Gaussianity limits.

Contribution

It provides a detailed analysis of non-Gaussianity in the KKLMMT model and establishes bounds on string parameters considering observational constraints.

Findings

String coupling is constrained to be larger than 0.08

Effective string scale on the brane exceeds 1.3 x 10^{-4} M_p

Non-Gaussianity imposes significant bounds on model parameters

Abstract

We investigate the non-Gaussianity of the brane inflation which happens in the same throat in the framework of the generalized KKLMMT model. When we take the constraints from non-Gaussianity into account, various consequences are discussed including the bound on the string coupling, such as the string coupling is larger than 0.08 and the effective string scale on the brane is larger than $1.3 \times 10^{-4} M_p$ in KKLMMT model.