Probing cosmological physics with large scale motions of galaxies

The standard cosmological model based on dark energy, standard gravity,
and cold dark matter as the driver for structure formation has passed
important observational tests related to the present distribution of
matter on large scales (larger than a few 10s of Megaparsecs). It will
be argued that deviations from the standard model can be further probed
through signatures of the large scale motions (deviations from pure
Hubble flow) of galaxies. Some constraints on f(R) and DGP gravity will
be described using motions of galaxies in the nearby Universe.
It will be shown how future surveys of ~ a billion galaxies like
Euclid will allow constraints on dark energy models.