Large Scale Suppression of Scalar Power on a Spatial Condensation

TL;DR

This paper proposes a modified single field inflation model with SO(3) symmetric moduli fields that induces a phase transition, leading to suppression of large-scale scalar power spectrum, potentially resolving observational tensions.

Contribution

It introduces a novel inflation model with spatially linear moduli fields causing a phase transition and large-scale power suppression.

Findings

Induces a phase transition during early inflation

Achieves suppression of large-scale scalar power spectrum

Provides a potential explanation for Planck and BICEP2 data tension

Abstract

Suppression of the scalar power spectrum on large scales is one way to reconcile the tension between Planck and BICEP2 data. This suppression can occur by introducing a phase transition from the fast-roll phase to the slow-roll phase in a single field inflation model. In this paper we consider a deformed single field inflation model in terms of three SO(3) symmetric moduli fields. We find that spatially linear solutions for the moduli fields induces a phase transition during the early stage of the inflation and the suppression of scalar power spectrum at large scale perturbation modes.