Genericness of Big Bounce in isotropic loop quantum cosmology

TL;DR

This paper demonstrates that in isotropic loop quantum cosmology, the Big Bounce phenomenon is a universal feature unaffected by quantization choices, with implications for early universe density perturbations.

Contribution

It shows the genericness of the Big Bounce in isotropic loop quantum cosmology, independent of quantization ambiguities and scalar field dynamics.

Findings

Big Bounce is a universal feature in isotropic loop quantum cosmology.

The bounce volume is characterized by a single parameter.

The bounce provides a minimum length scale affecting density perturbations.

Abstract

The absence of isotropic singularity in loop quantum cosmology can be understood in an effective classical description as the universe exhibiting a Big Bounce. We show that with scalar matter field, the big bounce is generic in the sense that it is independent of quantization ambiguities and details of scalar field dynamics. The volume of the universe at the bounce point is parametrized by a single parameter. It provides a minimum length scale which serves as a cut-off for computations of density perturbations thereby influencing their amplitudes.