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It’ll All B-A-O-kay – How the BAO Feature Guards Cosmological Information From Nonlinear Evolution

1 May 2021, 18:22 UTC
It’ll All B-A-O-kay – How the BAO Feature Guards Cosmological Information From Nonlinear Evolution
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Title: On the Robustness of the Acoustic Scale in the Low-Redshift Clustering of MatterAuthors: Daniel Eisenstein, Hee-Jong Seo, Martin WhiteFirst Author’s Institution: Seward Observatory, University of Arizona, 933 N. Cherry Ave., Tuscon, AZ 85121 [at time of publication – 2007]CLASSIC PAPER ALERT!The Baryon Acoustic Oscillation (BAO) feature provides perhaps the most famous cosmological parameter constraints from large-scale structure (LSS). This is not a surprising statement today – the BAO scale has been measured repeatedly (in particular by the Baryon Oscillation Spectroscopic Survey [BOSS]) and is used in modern LSS analyses to constrain cosmological parameters like the Hubble parameter and quantify the impact of dark energy. These constraints are possible because the BAO feature is the result of sound waves in the early universe. However, in the not-so-distant past, the prospect of measuring the BAO feature from the distribution of galaxies tracing large-scale structure was murkier. In particular, nonlinear structure formation (which produces the cosmic web) could have potentially clouded the cosmological interpretation of the BAO feature.But did it? If so, how bad was the contamination? The authors of today’s classic paper meticulously walked through that exact question. We’ll explore a small slice of their results in this bite.On the evolution ...

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