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Title: The impact of the fiducial cosmology assumption on BAO distance scale measurements

Abstract

ABSTRACT Standard analysis pipelines for measurements of Baryon Acoustic Oscillations (BAO) in galaxy surveys make use of a fiducial cosmological model to guide the data compression required to transform from observed redshifts and angles to the measured angular and radial BAO peak positions. In order to remove any dependence on the fiducial cosmology from the results, all models compared to the data should mimic the compression and its dependence on the fiducial model. In practice, approximations are made when testing models: (1) There is assumed to be no residual dependence on the fiducial cosmology after reconstruction, (2) differences in the distance–redshift relationship are assumed to match a linear scaling, and (3) differences in clustering between true and fiducial models are assumed to be removed by the free parameters used to null the non-BAO signal. We test these approximations using the current standard measurement procedure with a set of halo catalogues from the aemulus suite of N-body simulations, which span a range of wCDM cosmological models. We focus on reconstruction of the primordial BAO and locating the BAO. For the range of wCDM cosmologies covered by the aemulus suite, we find no evidence for systematic errors in the measured BAO shift parameters α∥ and α⊥ to $$\lt 0.1\%$$. However, the measured errors $$\sigma _{\alpha _{\parallel }}$$ and $$\sigma _{\alpha _{\bot }}$$ show a notable absolute increase by up to +0.001 and +0.002, respectively, in the case that the fiducial cosmology does not match the truth. These effects on the inferred BAO scale will be important, given the precision of measurements expected from future surveys including DESI, Euclid, and WFIRST.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3];  [4];  [4];  [5]
  1. Institute of Cosmology & Gravitation, University of Portsmouth, Dennis Sciama Building, Portsmouth PO1 3FX, UK
  2. Institute of Cosmology & Gravitation, University of Portsmouth, Dennis Sciama Building, Portsmouth PO1 3FX, UK, Lawrence Berkeley National Lab, 1 Cyclotron Rd, Berkeley CA 94720, USA
  3. Waterloo Centre for Astrophysics, Department of Physics and Astronomy, University of Waterloo, Waterloo, ON N2L 3G1, Canada, Perimeter Institute for Theoretical Physics, Waterloo, ON N2L 2Y5, Canada
  4. Department of Physics, Stanford University, 382 Via Pueblo Mall, Stanford, CA 94305, USA, Kavli Institute for Particle Astrophysics & Cosmology, P. O. Box 2450, Stanford University, Stanford, CA 94305, USA, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
  5. Laboratory of Astrophysics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Observatoire de Sauverny, CH-1290 Versoix, Switzerland
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC); European Research Council (ERC)
OSTI Identifier:
1615123
Alternate Identifier(s):
OSTI ID: 1638177
Grant/Contract Number:  
AC02-76SF00515; 614030; AC02-05CH11231
Resource Type:
Published Article
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 494 Journal Issue: 2; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Country of Publication:
United Kingdom
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Cosmological parameters; cosmology observations; large-scale structure of universe

Citation Formats

Carter, Paul, Beutler, Florian, Percival, Will J., DeRose, Joseph, Wechsler, Risa H., and Zhao, Cheng. The impact of the fiducial cosmology assumption on BAO distance scale measurements. United Kingdom: N. p., 2020. Web. doi:10.1093/mnras/staa761.
Carter, Paul, Beutler, Florian, Percival, Will J., DeRose, Joseph, Wechsler, Risa H., & Zhao, Cheng. The impact of the fiducial cosmology assumption on BAO distance scale measurements. United Kingdom. doi:https://doi.org/10.1093/mnras/staa761
Carter, Paul, Beutler, Florian, Percival, Will J., DeRose, Joseph, Wechsler, Risa H., and Zhao, Cheng. Wed . "The impact of the fiducial cosmology assumption on BAO distance scale measurements". United Kingdom. doi:https://doi.org/10.1093/mnras/staa761.
@article{osti_1615123,
title = {The impact of the fiducial cosmology assumption on BAO distance scale measurements},
author = {Carter, Paul and Beutler, Florian and Percival, Will J. and DeRose, Joseph and Wechsler, Risa H. and Zhao, Cheng},
abstractNote = {ABSTRACT Standard analysis pipelines for measurements of Baryon Acoustic Oscillations (BAO) in galaxy surveys make use of a fiducial cosmological model to guide the data compression required to transform from observed redshifts and angles to the measured angular and radial BAO peak positions. In order to remove any dependence on the fiducial cosmology from the results, all models compared to the data should mimic the compression and its dependence on the fiducial model. In practice, approximations are made when testing models: (1) There is assumed to be no residual dependence on the fiducial cosmology after reconstruction, (2) differences in the distance–redshift relationship are assumed to match a linear scaling, and (3) differences in clustering between true and fiducial models are assumed to be removed by the free parameters used to null the non-BAO signal. We test these approximations using the current standard measurement procedure with a set of halo catalogues from the aemulus suite of N-body simulations, which span a range of wCDM cosmological models. We focus on reconstruction of the primordial BAO and locating the BAO. For the range of wCDM cosmologies covered by the aemulus suite, we find no evidence for systematic errors in the measured BAO shift parameters α∥ and α⊥ to $\lt 0.1\%$. However, the measured errors $\sigma _{\alpha _{\parallel }}$ and $\sigma _{\alpha _{\bot }}$ show a notable absolute increase by up to +0.001 and +0.002, respectively, in the case that the fiducial cosmology does not match the truth. These effects on the inferred BAO scale will be important, given the precision of measurements expected from future surveys including DESI, Euclid, and WFIRST.},
doi = {10.1093/mnras/staa761},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 2,
volume = 494,
place = {United Kingdom},
year = {2020},
month = {3}
}

Journal Article:
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DOI: https://doi.org/10.1093/mnras/staa761

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