Probing signatures of bounce inflation with current observations

TL;DR

This paper investigates bouncing inflation models using current observational data, proposing a general parametrization of the primordial power spectrum and demonstrating that such models can explain large-scale features in the CMB.

Contribution

It introduces a new parametrization of the primordial power spectrum for bounce inflation models and constrains these models using current cosmological observations.

Findings

Bouncing models can explain large-scale CMB features.

The analysis constrains bouncing parameters with observational data.

Bouncing inflation remains compatible with current observations.

Abstract

The aim of this paper is to probe the features of the bouncing cosmology with the current observational data. Basing on bounce inflation model, with high derivative term, we propose a general parametrization of primordial power spectrum which includes the typical bouncing parameters, such as bouncing time-scale, and energy scale. By applying Markov Chain Monto Carlo analysis with current data combination of Planck 2015, BAO and JLA, we report the posterior probability distributions of the parameters. We find that, bouncing models can well explain CMB observations, especially the deficit and oscillation on large scale in TT power spectrum.