A robust BAO extractor

Eugenio Noda, Marco Peloso, Massimo Pietroni

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

We define a procedure to extract the oscillating part of a given nonlinear Power Spectrum, and derive an equation describing its evolution including the leading effects at all scales. The intermediate scales are taken into account by standard perturbation theory, the long range (IR) displacements are included by using consistency relations, and the effect of small (UV) scales is included via effective coefficients computed in simulations. We show that the UV effects are irrelevant in the evolution of the oscillating part, while they play a crucial role in reproducing the smooth component. Our «extractor» operator can be applied to simulations and real data in order to extract the Baryonic Acoustic Oscillations (BAO) without any fitting function and nuisance parameter. We conclude that the nonlinear evolution of BAO can be accurately reproduced at all scales down to 0z= by our fast analytical method, without any need of extra parameters fitted from simulations.

Original languageEnglish (US)
Article number007
JournalJournal of Cosmology and Astroparticle Physics
Volume2017
Issue number8
DOIs
StatePublished - Aug 4 2017

Keywords

  • baryon acoustic oscillations
  • cosmological perturbation theory

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