Missing components in ΛCDM from DESI Y1 baryonic acoustic oscillation measurements: Insights from redshift remapping

Aims. We explore transformations of the Friedman-Lemaître-Robertson-Walker (FLRW) metric and cosmological parameters that align with observational data while aiming to gain insights into potential extensions of standard cosmological models. Methods. We modified the FLRW metric by introducing a scaling factor, e 2Θ( a ) –the cosmological scaling function (CSF), which alters the standard relationship between cosmological redshift and the cosmic scale factor without affecting angular measurements or cosmic microwave background (CMB) anisotropies. Using data from DESI Year 1, Pantheon+ supernovae, and the Planck CMB temperature power spectrum, we constrained both the CSF and cosmological parameters through a Markov chain Monte Carlo approach. Results. Our results indicate that the CSF model fits observational data with a lower Hubble constant (although it is compatible with the value given by Planck 2018 within 1 σ ) and is predominantly dark matter dominated. Additionally, the CSF model produces temperature and lensing power spectra similar to those predicted by the standard model, though with lower values in the CSF model at large scales. We also checked that when fitting a CSF model without dark energy to the data, we obtain a more negative conformal function. This suggests that the CSF model may offer hints about missing elements and opens up a new avenue for exploring physical interpretations of cosmic acceleration.

Authors

Publication Details

Journal
Astronomy and Astrophysics
Published
2025-08-18
DOI
https://doi.org/10.1051/0004-6361/202555033
Citations
1
Primary Topic
High-Energy Particle Collisions Research
Type
article
Field-Weighted Citation Impact
1.87

Funders

Controls
|||
ALL TIME
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
article

Missing components in ΛCDM from DESI Y1 baryonic acoustic oscillation measurements: Insights from redshift remapping

D. Kirkby, Will J. Percival, A. Muñoz-Gutiérrez, Radosław Wojtak et al.
1 citations
Astronomy and Astrophysics
High-Energy Particle Collisions Research
1.87
article

Missing components in ΛCDM from DESI Y1 baryonic acoustic oscillation measurements: Insights from redshift remapping

D. Kirkby, Will J. Percival, A. Muñoz-Gutiérrez, Radosław Wojtak, G Rossi, S. Nadathur, Gregory Tarlé, Jorge L. Cervantes–Cota, José Edgar Madriz Aguilar, Laurent Le Guillou, David Sprayberry, Daniel I. Brooks, M. Landriau, P. Doel, Ignasi Pérez-Ràfols, Axel de la Macorra, B. A. Weaver, M. E. Levi, Marc Manera, T.S. Li, E. Fernández-García, Eusebio Sanchez, Satya Gontcho A Gontcho, S. BenZvi, O. Alves, ENRIQUE GAZTAÑAGA, M. Schubnell, Steven P. Ahlen, Aaron Meisner, Davide Bianchi, Theodore S. Kisner, John Moustakas, Georgios Valogiannis, K. Honscheid, Mustapha Ishak, Hee‐Jong Seo, Hu Zou, T. Claybaugh, R. Miquel, G. Gutierrez, Francisco Prada, S. Juneau
article en
1 citations

Abstract

Aims. We explore transformations of the Friedman-Lemaître-Robertson-Walker (FLRW) metric and cosmological parameters that align with observational data while aiming to gain insights into potential extensions of standard cosmological models. Methods. We modified the FLRW metric by introducing a scaling factor, e 2Θ( a ) –the cosmological scaling function (CSF), which alters the standard relationship between cosmological redshift and the cosmic scale factor without affecting angular measurements or cosmic microwave background (CMB) anisotropies. Using data from DESI Year 1, Pantheon+ supernovae, and the Planck CMB temperature power spectrum, we constrained both the CSF and cosmological parameters through a Markov chain Monte Carlo approach. Results. Our results indicate that the CSF model fits observational data with a lower Hubble constant (although it is compatible with the value given by Planck 2018 within 1 σ ) and is predominantly dark matter dominated. Additionally, the CSF model produces temperature and lensing power spectra similar to those predicted by the standard model, though with lower values in the CSF model at large scales. We also checked that when fitting a CSF model without dark energy to the data, we obtain a more negative conformal function. This suggests that the CSF model may offer hints about missing elements and opens up a new avenue for exploring physical interpretations of cosmic acceleration.

Astronomy and AstrophysicsVol. 701
Ministerio de Ciencia e Innovación, Deutsches Elektronen-Synchrotron, Agencia Estatal de Investigación
Openalex Percentile: Top 12%
High-Energy Particle Collisions Research
1.87
DOIOpen Access PDFOpenAlex
AI Navigator

Ask Laika to Summarize, Analyze, and Connect papers live on the map.

Summarize Papers & Methodologies

Extract key findings, datasets, and comparative methods across publications.

Benchmark Rankings & Visual Analytics

Rank top research institutions, authors, funders, topics, and journals by Field-Weighted Citation Impact (FWCI) and paper volume with instant charts.

Connect Distant Disciplines

Bridge topological clusters on the map to find hidden collaborative intersections.