Power-law cosmology, SN Ia, and BAO

TL;DR

This paper assesses power-law cosmology models against observational data from Supernova Ia and baryon acoustic oscillations, finding that a universe expanding as t^{3/2} fits well with current measurements.

Contribution

It provides updated observational constraints on power-law cosmology models using recent SN Ia and BAO data, highlighting the viability of a t^{3/2} expansion regime.

Findings

Power-law cosmology with a t^{3/2} expansion fits observational data well.

A spatially flat universe with a power-law expansion is consistent with current measurements.

The model remains a plausible alternative to standard cosmology based on observational constraints.

Abstract

We revise observational constraints on the class of models of modified gravity which at low redshifts lead to a power-law cosmology. To this end we use available public data on Supernova Ia and on baryon acoustic oscillations. We show that the expansion regime $a(t) \sim t^{\beta}$ with $\beta$ close to 3/2 a spatially flat universe is a good fit to these data.