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Phenomenology of BAO evolution from Lagrangian to Eulerian Space

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arxiv 1612.04521 v1 pith:CUB6JXUH submitted 2016-12-14 astro-ph.CO

classification astro-ph.CO
keywords biasdistributioninitiallagrangianlinearscalevelocityacoustic
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The baryon acoustic oscillation (BAO) feature provides an important distance scale for the measurement of the expansion history of the Universe. Theoretical models of the BAO in the distribution of biased tracers of the large scale structure usually rely on an initially linear BAO. With aid of N-body simulations, we demonstrate that the BAO in the initial (Lagrangian) halo 2-point function is significantly sharper than in the linear matter distribution, in agreement with peak theory. Using this approach, we delineate the scale-dependence induced by the higher-derivative and velocity bias before assessing how much of the initial BAO enhancement survives until the collapse epoch. Finally, we discuss the extent to which the velocity or gravity bias, which is also imprinted in the displacement field of halos, affects the contrast of the BAO obtained with a reconstruction.

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  1. Scale-dependent bias and mode coupling in redshift-space clustering near the BAO scale

    astro-ph.CO 2025-06 conditional novelty 6.0 of 10

    A biased-tracer clustering model that adds scale-dependent density/velocity bias and mode coupling accurately describes BAO-scale redshift-space multipoles in simulations, and scale-dependent bias matters more than mo...

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