Multi-Stream Inflation

TL;DR

This paper introduces a multi-stream inflation model with spontaneous symmetry breaking that predicts large, scale-dependent non-Gaussianity and features in the CMB, offering explanations for observed anomalies.

Contribution

It presents a novel double field inflation model capable of generating distinctive non-Gaussian signatures and CMB features not addressed by previous models.

Findings

Large, scale-dependent non-Gaussianity predicted

Features in the CMB power spectrum produced

Hemispherical power asymmetry explained

Abstract

We propose a "multi-stream" inflation model, which is a double field model with spontaneous breaking and restoration of an approximate symmetry. We calculate the density perturbation and non-Gaussianity in this model. We find that this model can have large, scale dependent, and probably oscillating non-Gaussianity. We also note that our model can produce features in the CMB power spectrum and hemispherical power asymmetry.