Cosmic distance duality and cosmic transparency
  We compare distance measurements obtained from two distance indicators,
Super- novae observations (standard candles) and Baryon acoustic oscillation
data (standard rulers). The Union2 sample of supernovae with BAO data from
SDSS, 6dFGS and the latest BOSS and WiggleZ surveys is used in search for
deviations from the distance duality relation. We find that the supernovae are
brighter than expected from BAO measurements. The luminosity distances tend to
be smaller then expected from angular diameter distance estimates as also found
in earlier works on distance duality, but the trend is not statistically
significant. This further constrains the cosmic transparency.
