A No-Scale Inflationary Model to Fit Them All

TL;DR

This paper proposes a minimal two-field no-scale supergravity inflation model that bridges the gap between quadratic and Starobinsky-like inflation, aligning with observational data on the spectral index.

Contribution

Introduction of a novel two-field no-scale supergravity model that interpolates between different inflationary scenarios while maintaining key observational predictions.

Findings

Model successfully interpolates between quadratic and Starobinsky inflation.

Predicts spectral index n_s approximately 0.96.

Compatible with BICEP2 and Planck data constraints.

Abstract

The magnitude of B-mode polarization in the cosmic microwave background as measured by BICEP2 favours models of chaotic inflation with a quadratic $m^2 \phi^2/2$ potential, whereas data from the Planck satellite favour a small value of the tensor-to-scalar perturbation ratio $r$ that is highly consistent with the Starobinsky $R + R^2$ model. Reality may lie somewhere between these two scenarios. In this paper we propose a minimal two-field no-scale supergravity model that interpolates between quadratic and Starobinsky-like inflation as limiting cases, while retaining the successful prediction $n_s \simeq 0.96$.