Can a late-time cosmological model based on baby universe absorption explain the z-variation of w?

TL;DR

This paper proposes a late-time cosmological model where universe absorption of baby universes explains exponential expansion and predicts a z-dependent w(z) parameter, with w(z) less than -1 at high redshift.

Contribution

It introduces a novel cosmological model based on baby universe absorption that accounts for universe expansion without a cosmological constant.

Findings

The model explains exponential expansion without a cosmological constant.

Predicts w(z) < -1 for sufficiently high redshift.

Shows a z-dependence of the equation of state parameter w(z).

Abstract

We point out that a simple late-time cosmological model where our Universe can absorb "baby universes" explains the exponential expansion of our universe without the need of a cosmological constant and leads to a z-dependence of the parameter w(z) in the equation of state. In this model w(z) is less than -1 for z sufficiently large.