Observable Gravity Waves From Supersymmetric Hybrid Inflation

TL;DR

This paper explores supersymmetric hybrid inflation models that predict observable gravity waves with a tensor-to-scalar ratio around 0.03, compatible with current spectral index constraints and testable by upcoming experiments.

Contribution

It identifies specific supersymmetric hybrid inflation models capable of producing detectable gravity waves within current observational bounds.

Findings

Tensor-to-scalar ratio can reach ~0.03 in these models.

Scalar spectral index remains within WMAP bounds.

Running of spectral index is constrained to |dn_s/dlnk| ≤ 0.01.

Abstract

We identify models of supersymmetric hybrid inflation in which the tensor-to-scalar ratio, a canonical measure of gravity waves produced during inflation, can be as large as 0.03 or so, which will be tested by the Planck satellite experiment. The scalar spectral index lies within the WMAP one sigma bounds, while $|d n_s / d\ln k| \lesssim 0.01$.