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Cited by 69Cosmology and Gravitation TheoriesGalaxies: Formation, Evolution, PhenomenaDark Matter and Cosmic Phenomena

Robustness of baryon acoustic oscillation constraints for early-Universe modifications ofΛCDMcosmology

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Bernal, José Luis, Smith, Tristan L., Boddy, Kimberly K., Kamionkowski, Marc·2020·Physical Review D
DOI 10.1103/physrevd.102.123515
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Abstract

Baryon acoustic oscillations (BAO) provide a robust standard ruler and can be used to constrain the expansion history of the Universe at low redshift. Standard BAO analyses return a model-independent measurement of the expansion rate and the comoving angular diameter distance as a function of redshift, normalized by the sound horizon at radiation drag. However, this methodology relies on anisotropic distance distortions of a fixed, precomputed template (obtained in a given fiducial cosmology) in order to fit the observations. Therefore, it may be possible that extensions to the consensus $\mathrm{\ensuremath{\Lambda}}\mathrm{CDM}$ add contributions to the BAO feature that cannot be captured by the template fitting. We perform mock BAO fits to power spectra computed assuming cosmological models that modify the growth of perturbations prior to recombination in order to test the robustness of the standard BAO analysis. We find no significant bias in the BAO analysis for the models under study ($\mathrm{\ensuremath{\Lambda}}\mathrm{CDM}$ with a free effective number of relativistic species, early dark energy, and a model with interactions between neutrinos and a fraction of the dark matter), even for cases that do not provide a good fit to Planck measurements of the cosmic microwave background power spectra. This result supports the use of the standard BAO analysis and its measurements to perform cosmological parameter inference and to constrain exotic models. In addition, we provide a methodology to reproduce our study for different models and surveys, as well as discuss different options to handle eventual biases in the BAO measurements.

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  • The whole procedure leading to the BAO dataset may not necessarily be valid in extended DE models, where perturbations in the mildly nonlinear regime are important.

    “the whole procedure leading to the BAO dataset performed by the different collaborations may not necessarily be valid in extended DE models, where perturbations in the mildly nonlinear regime are important.”

    From Challenges of the Standard Cosmological Model (2022) · cites this paper as [67]

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Authors
Bernal, J. L., Smith, T. L., Boddy, K. K., & Kamionkowski, M.
Affiliations
  • Johns Hopkins University (US)
  • Swarthmore College (US)
  • The University of Texas at Austin (US)
ORCID
Venue
Physical Review D
Publisher
American Physical Society (APS)
Published
2020-12-04
Volume
102
Issue
12
ISSN
  • 2470-0010 (ISSN-L)
  • 2470-0029
DOI
10.1103/physrevd.102.123515
OpenAlex
W3110702024
Cited by
69
References
132
Citations by year
2026: 9 · 2025: 17 · 2024: 8 · 2023: 6 · 2022: 13 · 2021: 13 · 2020: 3
FWCI
3.90
Type
journal article
Language
en
Open access
Licence
link.aps.org/licenses/aps-default-license (vor)
Locations
  • Physical review. D/Physical review. D. (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • Works - Scholarship, Research, & Creative Expression (Swarthmore College) (submittedVersion)
  • arXiv (Cornell University) (cc-by)
Funders
  • Semiconductor Research Corporation
  • National Aeronautics and Space Administration (80NSSC18K0728)
  • Allan C. and Dorothy H. Davis Fellowship
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Cosmology and Gravitation Theories
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
  • Physical Sciences › Physics and Astronomy › Nuclear and High Energy Physics › Dark Matter and Cosmic Phenomena
Keywords
baryon acoustic oscillations, template fitting, early dark energy, effective number of relativistic species, cosmological parameter estimation

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