Supersonic Relative Velocity Effect on the Baryonic Acoustic Oscillation Measurements

Abstract

We investigate the effect of supersonic relative velocities between baryons and dark matter, recently shown to arise generically at high redshift, on baryonic acoustic oscillation (BAO) measurements at low redshift. The amplitude of the relative velocity effect at low redshift is model-dependent, but can be parameterized by using an unknown bias. We find that if unaccounted, the relative velocity effect can shift the BAO peak position and bias estimates of the dark energy equation-of-state due to its non-smooth, out-of-phase oscillation structure around the BAO scale. Fortunately, the relative velocity effect can be easily modeled in constraining cosmological parameters without substantially inflating the error budget. We also demonstrate that the presence of the relative velocity effect gives rise to a unique signature in the galaxy bispectrum, which can be utilized to isolate this effect. Future dark energy surveys can accurately measure the relative velocity effect and subtract it from the power spectrum analysis to constrain dark energy models with high precision.

17 pages, 6 figures, submitted to JCAP

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• Simulations and symmetries
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• Globular Clusters and Dark Satellite Galaxies through the Stream Velocity
• Supersonic Relative Velocity between Dark Matter and Baryons: A Review
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• Baryon-CDM isocurvature galaxy bias with IllustrisTNG
• How Density Environment Changes the Influence of the Dark Matter-Baryon Streaming Velocity on the Cosmological Structure Formation
• New constraints on cosmological modified gravity theories from anisotropic three-point correlation functions of BOSS DR12 galaxies
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• Constraining the relative velocity effect using the Baryon Oscillation Spectroscopic Survey
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• Imprints of Reionization in Galaxy Clustering
• Measuring the cosmic expansion rate using 21-cm velocity acoustic oscillations
• Supersonic baryon-CDM velocities and CMB B-mode polarization
• Probing Compensated Isocurvature with the 21-cm Signal during Cosmic Dawn
• Optical depth to reionization from perturbative 21cm clustering
• Effect of supersonic relative motion between baryons and dark matter on collapsed objects
• Distance Probes of Dark Energy
• On the halo velocity bias
• BAO cosmology in non-spatially flat background geometry from BOSS+eBOSS and lessons for future surveys
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• Neutrino winds on the sky
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• Non-Gaussianity in the Squeezed Three-Point Correlation from the Relativistic Effects
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