The CMB bispectrum from bouncing cosmologies

TL;DR

This paper calculates the CMB bispectrum for bouncing cosmologies inspired by Loop Quantum Cosmology, showing potential detectability in Planck data despite the primordial bispectrum's decay at large scales.

Contribution

It introduces a detailed computation of the CMB bispectrum for bouncing models from Loop Quantum Cosmology, highlighting their observational prospects.

Findings

CMB bispectrum signal-to-noise ratio exceeds 10 for scales 30

Primordial bispectrum decays exponentially at large scales

Potential detectability with Planck data

Abstract

In this paper we compute the CMB bispectrum for bouncing models motivated by Loop Quantum Cosmology. Despite the fact that the primordial bispectrum of these models is decaying exponentially above a large pivot scale, we find that the cumulative signal-to-noise ratio of the bispectrum induced in the CMB from scales $\ell < 30$ is larger than $10$ in all cases of interest and therefore can, in principle, be detected in the Planck data.