%0 Journal Article %J Monthly Notices of the Royal Astronomical Society %D 2018 %T Constraining the baryon-dark matter relative velocity with the large-scale three-point correlation function of the SDSS BOSS DR12 CMASS galaxies %A Slepian, Zachary %A Daniel J. Eisenstein %A Blazek, Jonathan A. %A Brownstein, Joel R. %A Chuang, Chia-Hsun %A Gil-Marín, Héctor %A Ho, Shirley %A Francisco-Shu Kitaura %A McEwen, Joseph E. %A Will J. Percival %A Ashley J. Ross %A Rossi, Graziano %A Seo, Hee-Jong %A Slosar, Anže %A Vargas-Magaña, Mariana %K cosmological parameters; cosmology: observations %X We search for a galaxy clustering bias due to a modulation of galaxynumber with the baryon-dark matter relative velocity resulting fromrecombination-era physics. We find no detected signal and place theconstraint bv < 0.01 on the relative velocity bias for theCMASS galaxies. This bias is an important potential systematic of baryonacoustic oscillation (BAO) method measurements of the cosmic distancescale using the two-point clustering. Our limit on the relative velocitybias indicates a systematic shift of no more than 0.3 per cent rms inthe distance scale inferred from the BAO feature in the BOSS two-pointclustering, well below the 1 per cent statistical error of thismeasurement. This constraint is the most stringent currently availableand has important implications for the ability of upcoming large-scalestructure surveys such as the Dark Energy Spectroscopic Instrument(DESI) to self-protect against the relative velocity as a possiblesystematic. %B Monthly Notices of the Royal Astronomical Society %V 474 %P 2109-2115 %8 February 1, 2018 %@ 0035-8711 %G eng %U http://adsabs.harvard.edu/abs/2018MNRAS.474.2109S %3 10.1093/mnras/stx2723