Cosmic distance duality and cosmic transparency
Remya Nair, Sanjay Jhingan, Deepak Jain
TL;DR
This paper tests the cosmic distance duality relation by comparing supernova and BAO data, finding a slight, statistically insignificant trend of supernovae being brighter than expected, which constrains cosmic transparency.
Contribution
It provides an empirical comparison of distance indicators to test the validity of the cosmic distance duality relation using recent survey data.
Findings
Supernovae appear brighter than expected from BAO data.
No statistically significant deviation from the distance duality relation.
Results place constraints on cosmic transparency.
Abstract
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.
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