  Models of the very early universe, including inflationary models, are argued
to produce varying universe domains with different values of fundamental
constants and cosmic parameters. Using the cosmological hydrodynamical
simulation code from the eagle collaboration, we investigate the effect of the
cosmological constant on the formation of galaxies and stars. We simulate
universes with values of the cosmological constant ranging from Lambda = 0 to
Lambda_0 = 300, where Lambda_0 is the value of the cosmological constant in our
Universe. Because the global star formation rate in our Universe peaks at t =
3.5 Gyr, before the onset of accelerating expansion, increases in Lambda of
even an order of magnitude have only a small effect on the star formation
history and efficiency of the universe. We use our simulations to predict the
observed value of the cosmological constant, given a measure of the multiverse.
Whether the cosmological constant is successfully predicted depends crucially
on the measure. The impact of the cosmological constant on the formation of
structure in the universe does not seem to be a sharp enough function of Lambda
to explain its observed value alone.
