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25 April 2024

» arxiv » 1607.6098

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Constraining the Baryon-Dark Matter Relative Velocity with the Large-Scale 3-Point Correlation Function of the SDSS BOSS DR12 CMASS Galaxies
Zachary Slepian ; Daniel J. Eisenstein ; Jonathan A. Blazek ; Joel R. Brownstein ; Chia-Hsun Chuang ; Héctor Gil-Marín ; Shirley Ho ; Francisco-Shu Kitaura ; Joseph E. McEwen ; Will J. Percival ; Ashley J. Ross ; Graziano Rossi ; Hee-Jong Seo ; Anže Slosar ; Mariana Vargas-Magaña ;
Date:	20 Jul 2016
Abstract:	We search for a galaxy clustering bias due to a modulation of galaxy number with the baryon-dark matter relative velocity resulting from recombination-era physics. We find no detected signal and place the constraint $b_v < 0.01$ on the relative velocity bias for the CMASS galaxies. This bias is an important potential systematic of Baryon Acoustic Oscillation (BAO) method measurements of the cosmic distance scale using the 2-point clustering. Our limit on the relative velocity bias indicates a systematic shift of no more than $0.3\%$ rms in the distance scale inferred from the BAO feature in the BOSS 2-point clustering, well below the $1\%$ statistical error of this measurement. This constraint is the most stringent currently available and has important implications for the ability of upcoming large-scale structure surveys such as DESI to self-protect against the relative velocity as a possible systematic.
Source:	arXiv, 1607.6098
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