Anze Slosar: Peculiar velocities from Supernova Ia

Anze Slosar,  Berkeley Center for Cosmological Physics, University of California

Peculiar velocities from Supernova Ia

Supernovae Ia act as standard candles and can be used to constrain the
background evolution of the Universe. However, their luminosities are
perturbed in the real, non completelly homegeneous Universe. The two
most important effects are lensing for far-away supernovae and
peculiar velocities for nearby supernovae. In this talk I will discuss
the latter effect. Since coherent velocity flows are expected on
large scales one expects to see coherent perturbations to the apparent
luminosities of nearby supernovae. This effect has recently been
detected at high statistical significance. I will discuss present and
future constraints on sigma8, effect on Hubble diagram measurements
and potential systematics in the future SN surveys.