paper

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

arXiv:1604.04631 · doi:10.3847/1538-4357/aac88f

Abstract

We test the distance--duality relation between cosmological luminosity distance () from the JLA SNe Ia compilation (arXiv:1401.4064) and angular-diameter distance () based on Baryon Oscillation Spectroscopic Survey (BOSS; arXiv:1607.03155) and WiggleZ baryon acoustic oscillation measurements (arXiv:1105.2862, arXiv:1204.3674). The measurements are matched to redshift by a statistically consistent compression procedure. With Monte Carlo methods, nontrivial and correlated distributions of can be explored in a straightforward manner without resorting to a particular evolution template . Assuming independent constraints on cosmological parameters that are necessary to obtain and values, we find 9% constraints consistent with from the analysis of SNIa + BOSS and an 18% bound results from SNIa + WiggleZ. These results are contrary to previous claims that has been found close to or above the 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 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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