A robust BAO extractor

Journal Article · Tue Aug 01 04:00:00 EDT 2017 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2017/08/007· OSTI ID:22676072

Noda, Eugenio; Pietroni, Massimo ^[1]; Peloso, Marco ^[2]

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1. Dipartimento di Scienze Matematiche, Fisiche ed Informatiche dell'Università di Parma, Parco Area delle Scienze 7/a, I-43124 Parma (Italy)
2. School of Physics and Astronomy, and Minnesota Institute for Astrophysics, University of Minnesota, Minneapolis, 55455 (United States)

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 0 z = by our fast analytical method, without any need of extra parameters fitted from simulations.

• OSTI ID: 22676072
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 08 Vol. 2017; ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
BARYONS
DENSITY
DISTURBANCES
EQUATIONS
EVOLUTION
FLUCTUATIONS
NONLINEAR PROBLEMS
OSCILLATIONS
PERTURBATION THEORY
RELATIVISTIC RANGE
SIMULATION
SPACE
SPECTRA