Statistical Test of Distance--Duality Relation with Type Ia Supernovae and Baryon Acoustic Oscillations

Abstract

We test the distance--duality relation $\eta \equiv d_L/[(1+z{)}^2{d}_A]=1$ between cosmological luminosity distance ($d_L$) from the JLA SNe Ia compilation (arXiv:1401.4064) and angular-diameter distance ($d_A$) based on Baryon Oscillation Spectroscopic Survey (BOSS; arXiv:1607.03155) and WiggleZ baryon acoustic oscillation measurements (arXiv:1105.2862, arXiv:1204.3674). The $d_L$ measurements are matched to $d_A$ redshift by a statistically consistent compression procedure. With Monte Carlo methods, nontrivial and correlated distributions of $\eta$ can be explored in a straightforward manner without resorting to a particular evolution template $\eta (z)$. Assuming independent constraints on cosmological parameters that are necessary to obtain $d_L$ and $d_A$ values, we find 9% constraints consistent with $\eta =1$ from the analysis of SNIa + BOSS and an 18% bound results from SNIa + WiggleZ. These results are contrary to previous claims that $\eta <1$ has been found close to or above the $1\sigma$ level. We discuss the effect of different cosmological parameter inputs and the use of the apparent deviation from distance--duality as a proxy of systematic effects on cosmic distance measurements. The results suggest possible systematic overestimation of SNIa luminosity distances compared with $d_A$ data when a Planck ΛCDM cosmological parameter inference (arXiv:1502.01589) is used to enhance the precision. If interpreted as an extinction correction due to a gray dust component, the effect is broadly consistent with independent observational constraints.

v1: Initial analysis; v2: Using BOSS DR12 consensus BAO data w/ expanded analysis; v3: Major revision & expansion; v4: Matching ApJ-accepted version, 11 pages, 4 tables, 6 figures. Code & data for replication: see https://doi.org/10.5281/zenodo.1219473 Comments welcome

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