Power-law cosmology, SN Ia, and BAO
  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.
