Bahr-Kalus, B;
Parkinson, D;
Lodha, K;
Mueller, E;
Chaussidon, E;
de Mattia, A;
Forero-Sanchez, D;
... Zou, H; + view all
(2025)
Model-independent measurement of the matter-radiation equality scale in DESI 2024.
Physical Review D: Particles, Fields, Gravitation and Cosmology
, 112
(6)
, Article 063553. 10.1103/yqm1-ybbv.
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Abstract
The peak of the matter power spectrum, known as the turnover (TO) scale, is determined by the horizon size at the time of matter-radiation equality. This scale can serve as a standard ruler, independent of other features in the matter power spectrum, such as baryon acoustic oscillations (BAO). Here, we present the first detection of the turnover in the galaxy autopower spectrum, utilizing the distribution of quasars and luminous red galaxies (LRG) measured by the Dark Energy Spectroscopic Instrument (DESI) during its first year of survey operations in a model-independent manner. To avoid confirmation bias, we first analyze the data using data blinding methods designed for the DESI baryon acoustic oscillation, redshift space distortion and scale-dependent bias signals. We measure the angle-averaged dilation distance
| Type: | Article |
|---|---|
| Title: | Model-independent measurement of the matter-radiation equality scale in DESI 2024 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/yqm1-ybbv |
| Publisher version: | https://doi.org/10.1103/yqm1-ybbv |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Astronomy & Astrophysics, Physical Sciences, Physics, Physics, Particles & Fields, PIPELINE, POWER-SPECTRUM, Science & Technology, SYSTEM, TARGET-SELECTION, VALIDATION |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10217004 |
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