Phenomenology of baryon acoustic oscillation evolution from Lagrangian to Eulerian space

Tobias Baldauf and Vincent Desjacques
Phys. Rev. D 95, 043535 – Published 24 February 2017

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.

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  • Received 25 December 2016

DOI:https://doi.org/10.1103/PhysRevD.95.043535

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Gravitation, Cosmology & Astrophysics

Authors & Affiliations

Tobias Baldauf*

  • Centre for Theoretical Cosmology, DAMTP, University of Cambridge, Cambridge CB3 0WA, United Kingdom

Vincent Desjacques

  • Physics Department, Technion, Haifa 3200003, Israel and Département de Physique Théorique and Center for Astroparticle Physics, Université de Genève, CH-1211 Genève, Switzerland

  • *t.baldauf@damtp.cam.ac.uk
  • dvince@physics.technion.ac.il

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Issue

Vol. 95, Iss. 4 — 15 February 2017

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