Phenomenology of BAO evolution from Lagrangian to Eulerian Space

Abstract

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.

17 pages, 5 figures

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Cited by in corpus (5)

• The effects of massive neutrinos on the linear point of the correlation function
• Optimal Transport Reconstruction of Baryon Acoustic Oscillations
• The clustering of critical points in the evolving cosmic web
• Non-perturbative halo clustering from cosmological density peaks
• Laguerre reconstruction of the correlation function on Baryon Acoustic Oscillation scales