Composite Inflation in the light of 2015 Planck data

TL;DR

This paper evaluates various composite inflation models against the 2015 Planck data, finding some models align well while others are in tension with observational constraints.

Contribution

It provides a comparative analysis of multiple composite inflation models using recent cosmological data, highlighting their compatibility with observations.

Findings

Technicolor inflation aligns well with Planck data.

Glueball inflation agrees within 2σ confidence level.

Super glueball and orientifold inflation are in tension with data.

Abstract

In this work, we examine cosmological constraints on models of composite inflation based on the slow-roll approximation by using the recent Planck measurement. We compare the spectral index of curvature perturbation (and its running) and the tensor-to-scalar ratio predicted by such models with Planck 2015 data. We find that the predictions of technicolor inflation are nicely consistent with the Planck analysis. Moreover, the predictions from the second model, glueball inflation, are in good agreement with the Planck data at $2\sigma$C.L. However, the final two models, super glueball inflation and orientifold inflation, favor only the rather large value of the tensor-to-scalar ratio of which the predictions are in tension with the Planck analysis.