What question did this study set out to answer?

Measure baryon acoustic oscillation distance scales across cosmic time using first-year galaxy and quasar spectra to test and constrain cosmological expansion models.

April 1, 2025Journal of Cosmology and Astroparticle PhysicsOpen Access

DESI 2024 III: baryon acoustic oscillations from galaxies and quasars

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Authors

AAA. G. Adame JAJ. Aguilar SAS. P. Ahlen

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Overview

Spectroscopic survey reveals precise baryon acoustic oscillation scales across 5.7 million cosmic tracers, suggesting subtle deviations from standard Planck cosmological models.

Key Points

Measure baryon acoustic oscillation distance scales across cosmic time using first-year galaxy and quasar spectra to test and constrain cosmological expansion models.
Analyzed catalog-level blinded spectroscopic data covering ~7,500 square degrees and an effective volume of ~18 Gpc³, utilizing over 5.7 million unique redshifts spanning 0.1 < z < 2.1.
Divided tracers into 300,017 Bright Galaxy Survey galaxies (0.1 < z < 0.4), 2,138,600 Luminous Red Galaxies (0.4 < z < 1.1), 2,432,022 Emission Line Galaxies (0.8 < z < 1.6), and 856,652 quasars (0.8 < z < 2.1).
Applied unified, physically motivated fitting and reconstruction pipelines validated on mock catalogs and benchmarked against re-analyzed SDSS BOSS and eBOSS datasets.
Detected baryon acoustic oscillations across all six redshift bins with an aggregate precision of ~0.52%, achieving a peak detection significance of 9.1σ (0.86% scale constraint) at z = 0.93.
Observed baryon acoustic oscillation scales that are systematically larger than the predictions of the Planck 2018-ΛCDM cosmological model at z < 0.8.

Cite This Study

Adame et al. (2025) studied this question.

synapsesocial.com/papers/6a0912cba2bc65e38873c6fa https://doi.org/10.1088/1475-7516/2025/04/012

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April 1, 2025Journal of Cosmology and Astroparticle PhysicsOpen Access

DESI 2024 III: baryon acoustic oscillations from galaxies and quasars

View Full Paper

Ask AI

Bookmark

Authors

AAA. G. Adame JAJ. Aguilar SAS. P. Ahlen

Discussion

Member takes

Overview

Spectroscopic survey reveals precise baryon acoustic oscillation scales across 5.7 million cosmic tracers, suggesting subtle deviations from standard Planck cosmological models.

Key Points

Measure baryon acoustic oscillation distance scales across cosmic time using first-year galaxy and quasar spectra to test and constrain cosmological expansion models.
Analyzed catalog-level blinded spectroscopic data covering ~7,500 square degrees and an effective volume of ~18 Gpc³, utilizing over 5.7 million unique redshifts spanning 0.1 < z < 2.1.
Divided tracers into 300,017 Bright Galaxy Survey galaxies (0.1 < z < 0.4), 2,138,600 Luminous Red Galaxies (0.4 < z < 1.1), 2,432,022 Emission Line Galaxies (0.8 < z < 1.6), and 856,652 quasars (0.8 < z < 2.1).
Applied unified, physically motivated fitting and reconstruction pipelines validated on mock catalogs and benchmarked against re-analyzed SDSS BOSS and eBOSS datasets.
Detected baryon acoustic oscillations across all six redshift bins with an aggregate precision of ~0.52%, achieving a peak detection significance of 9.1σ (0.86% scale constraint) at z = 0.93.
Observed baryon acoustic oscillation scales that are systematically larger than the predictions of the Planck 2018-ΛCDM cosmological model at z < 0.8.

Cite This Study

Adame et al. (2025) studied this question.

synapsesocial.com/papers/6a0912cba2bc65e38873c6fa https://doi.org/10.1088/1475-7516/2025/04/012

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