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Blazek JA, McEwen JE, Hirata CM. Streaming Velocities and the Baryon Acoustic Oscillation Scale. Phys Rev Lett. 2016;116(12):121303doi: 10.1103/PhysRevLett.116.121303.
Blazek, J. A., McEwen, J. E., & Hirata, C. M. (2016). Streaming Velocities and the Baryon Acoustic Oscillation Scale. Physical review letters, 116(12), 121303. https://doi.org/10.1103/PhysRevLett.116.121303
Blazek, Jonathan A, et al. "Streaming Velocities and the Baryon Acoustic Oscillation Scale." Physical review letters vol. 116,12 (2016): 121303. doi: https://doi.org/10.1103/PhysRevLett.116.121303
Blazek JA, McEwen JE, Hirata CM. Streaming Velocities and the Baryon Acoustic Oscillation Scale. Phys Rev Lett. 2016 Mar 25;116(12):121303. doi: 10.1103/PhysRevLett.116.121303. Epub 2016 Mar 25. PMID: 27058069.
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Phys Rev Lett. 2016 Mar 25;116(12):121303. doi: 10.1103/PhysRevLett.116.121303. Epub 2016 Mar 25.

Streaming Velocities and the Baryon Acoustic Oscillation Scale.

Physical review letters

Jonathan A Blazek, Joseph E McEwen, Christopher M Hirata

Affiliations

  1. Center for Cosmology and AstroParticle Physics, The Ohio State University, 191 West Woodruff Avenue, Columbus, Ohio 43210, USA.

PMID: 27058069 DOI: 10.1103/PhysRevLett.116.121303

Abstract

At the epoch of decoupling, cosmic baryons had supersonic velocities relative to the dark matter that were coherent on large scales. These velocities subsequently slow the growth of small-scale structure and, via feedback processes, can influence the formation of larger galaxies. We examine the effect of streaming velocities on the galaxy correlation function, including all leading-order contributions for the first time. We find that the impact on the baryon acoustic oscillation (BAO) peak is dramatically enhanced (by a factor of ∼5) over the results of previous investigations, with the primary new effect due to advection: if a galaxy retains memory of the primordial streaming velocity, it does so at its Lagrangian, rather than Eulerian, position. Since correlations in the streaming velocity change rapidly at the BAO scale, this advection term can cause a significant shift in the observed BAO position. If streaming velocities impact tracer density at the 1% level, compared to the linear bias, the recovered BAO scale is shifted by approximately 0.5%. This new effect, which is required to preserve Galilean invariance, greatly increases the importance of including streaming velocities in the analysis of upcoming BAO measurements and opens a new window to the astrophysics of galaxy formation.

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