Seeing through the cosmological bounce: Footprints of the contracting phase and luminosity distance in bouncing models

TL;DR

This paper investigates how luminosity distance evolves in contracting universe models, revealing complex behaviors that could constrain bouncing cosmologies and provide new observational insights into pre-Big Bang physics through gravitational waves.

Contribution

It analyzes the luminosity distance evolution in contracting universes, highlighting its non-trivial behavior and potential for observational tests of bouncing cosmologies.

Findings

Luminosity distance can decrease with increasing time intervals in contracting models.

Complex evolution patterns can impose constraints on bouncing cosmologies.

Potential to observe pre-Big Bang physics via gravitational waves.

Abstract

The evolution of the luminosity distance in a contracting universe is studied. It is shown that for quite a lot of natural dynamical evolutions, its behavior is far from trivial and its value can even decrease with an increasing time interval between events. The consequences are investigated and it is underlined that this could both put stringent consistency conditions on bouncing models and open a new observational window on "pre Big Bang" physics using standard gravitational waves.