Comment on "Quantum bounce and cosmic recall" [arXiv:0710.4543]

TL;DR

This paper critically examines a volume fluctuation inequality in bouncing cosmology, arguing it does not strongly constrain pre-bounce semiclassical states, thus challenging previous assumptions about the nature of pre-bounce conditions.

Contribution

It provides a critical analysis of an existing inequality, clarifying its limitations in constraining pre-bounce quantum states in cosmological models.

Findings

The inequality does not strongly restrict pre-bounce fluctuations.

Pre-bounce states may not have been semiclassical.

Previous conclusions about pre-bounce semiclassicality are not strongly supported.

Abstract

A recently derived inequality on volume fluctuations of a bouncing cosmology, valid for states which are semiclassical long after the bounce, does not restrict pre-bounce fluctuations sufficiently strongly to conclude that the pre-bounce state was semiclassical except in a very weak sense.