Constraining the relative velocity effect using the Baryon Oscillation Spectroscopic Survey

Abstract

We analyse the power spectrum of the Baryon Oscillation Spectroscopic Survey (BOSS), Data Release 12 (DR12) to constrain the relative velocity effect, which represents a potential systematic for measurements of the Baryon Acoustic Oscillation (BAO) scale. The relative velocity effect is sourced by the different evolution of baryon and cold dark matter perturbations before decoupling. Our power spectrum model includes all $1$-loop redshift-space terms corresponding to $v_{\mathrm{bc}}$ parameterised by the bias parameter $b_{v^2}$. We also include the linear terms proportional to the relative density, ${\delta }_{\mathrm{bc}}$, and relative velocity dispersion, ${\theta }_{\mathrm{bc}}$, which we parameterise with the bias parameters $b_{\delta }^{\mathrm{bc}}$ and $b_{\theta }^{\mathrm{bc}}$. Our data does not support a detection of the relative velocity effect in any of these parameters. Combining the low and high redshift bins of BOSS, we find limits of $b_{v^2}=0.012\pm 0.015(\pm 0.031)$, $b_{\delta }^{\mathrm{bc}}=-1.0\pm 2.5(\pm 6.2)$ and $b_{\theta }^{\mathrm{bc}}=-114\pm 55(\pm 175)$ with $68\%$ ($95\%$) confidence levels. These constraints restrict the potential systematic shift in $D_A(z)$, $H(z)$ and $f{\sigma }_8$, due to the relative velocity, to $1\%$, $0.8\%$ and $2\%$, respectively. Given the current uncertainties on the BAO measurements of BOSS these shifts correspond to $0.53\sigma$, $0.5\sigma$ and $0.22\sigma$ for $D_A(z)$, $H(z)$ and $f{\sigma }_8$, respectively.

References in corpus (3)

• The 2.5 m Telescope of the Sloan Digital Sky Survey
• Clustering of dark matter tracers: generalizing bias for the coming era of precision LSS
• Large-scale BAO signatures of the smallest galaxies

Cited by in corpus (18)

• Dynamical dark energy in light of the latest observations
• A new analysis of galaxy 2-point functions in the BOSS survey, including full-shape information and post-reconstruction BAO
• Redshift-Space Distortions in Lagrangian Perturbation Theory
• The galaxy power spectrum take on spatial curvature and cosmic concordance
• Scale-dependent galaxy bias, CMB lensing-galaxy cross-correlation, and neutrino masses
• Theoretical Systematics of Future Baryon Acoustic Oscillation Surveys
• Baryon Acoustic Oscillation Theory and Modelling Systematics for the DESI 2024 results
• The Reconstructed Power Spectrum in the Zeldovich Approximation
• Biased Tracers of Two Fluids in the Lagrangian Picture
• Redshift-space streaming velocity effects on the Lyman-$\alpha$ forest baryon acoustic oscillation scale
• Baryon-CDM isocurvature galaxy bias with IllustrisTNG
• Small-scale structure and the Lyman-$\alpha$ forest baryon acoustic oscillation feature
• Imprints of Reionization in Galaxy Clustering
• Neutrino Mass Signatures in the Galaxy Bispectrum
• Relative baryon-dark matter velocities in cosmological zoom simulations
• Impact of dark matter-baryon relative velocity on the 21cm forest
• Accelerating BAO Scale Fitting Using Taylor Series
• Cosmic voids and BAO with relative baryon-CDM perturbations