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Missing Components in ΛCDM from DESI Y1 BAO Measurements: Insights from Redshift Remapping

Fuente: arXiv

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Main Authors:	Fernández-García, E., Wojtak, R., Prada, F., Cervantes-Cota, J. L., Alves, O., Valogiannis, G., Aguilar, J., Ahlen, S., BenZvi, S., Bianchi, D., Brooks, D., Claybaugh, T., de la Macorra, A., Doel, P., Gaztañaga, E., Gontcho, S. Gontcho A, Gutierrez, G., Honscheid, K., Ishak, M., Juneau, S., Kirkby, D., Kisner, T., Landriau, M., Guillou, L. Le, Levi, M. E., Li, T. S., Manera, M., Meisner, A., Miquel, R., Moustakas, J., Muñoz-Gutiérrez, A., Nadathur, S., Percival, W. J., Pérez-Ràfols, I., Rossi, G., Sanchez, E., Schubnell, M., Seo, H., Sprayberry, D., Tarlé, G., Weaver, B. A., Zou, H.
Format:	Preprint
Published:	2025
Subjects:	Cosmology and Nongalactic Astrophysics
Online Access:	Acceder al recurso
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author	Fernández-García, E. Wojtak, R. Prada, F. Cervantes-Cota, J. L. Alves, O. Valogiannis, G. Aguilar, J. Ahlen, S. BenZvi, S. Bianchi, D. Brooks, D. Claybaugh, T. de la Macorra, A. Doel, P. Gaztañaga, E. Gontcho, S. Gontcho A Gutierrez, G. Honscheid, K. Ishak, M. Juneau, S. Kirkby, D. Kisner, T. Landriau, M. Guillou, L. Le Levi, M. E. Li, T. S. Manera, M. Meisner, A. Miquel, R. Moustakas, J. Muñoz-Gutiérrez, A. Nadathur, S. Percival, W. J. Pérez-Ràfols, I. Rossi, G. Sanchez, E. Schubnell, M. Seo, H. Sprayberry, D. Tarlé, G. Weaver, B. A. Zou, H.
author_facet	Fernández-García, E. Wojtak, R. Prada, F. Cervantes-Cota, J. L. Alves, O. Valogiannis, G. Aguilar, J. Ahlen, S. BenZvi, S. Bianchi, D. Brooks, D. Claybaugh, T. de la Macorra, A. Doel, P. Gaztañaga, E. Gontcho, S. Gontcho A Gutierrez, G. Honscheid, K. Ishak, M. Juneau, S. Kirkby, D. Kisner, T. Landriau, M. Guillou, L. Le Levi, M. E. Li, T. S. Manera, M. Meisner, A. Miquel, R. Moustakas, J. Muñoz-Gutiérrez, A. Nadathur, S. Percival, W. J. Pérez-Ràfols, I. Rossi, G. Sanchez, E. Schubnell, M. Seo, H. Sprayberry, D. Tarlé, G. Weaver, B. A. Zou, H.
contents	We explore transformations of the Friedman-Lemaître-Robertson-Walker (FLRW) metric and cosmological parameters that align with observational data, aiming to gain insights into potential extensions of standard cosmological models. We modify 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 constrain both the CSF and cosmological parameters through a Markov Chain Monte Carlo approach. 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 have 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.
format	Preprint
id	arxiv_https___arxiv_org_abs_2503_22469
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	Missing Components in ΛCDM from DESI Y1 BAO Measurements: Insights from Redshift Remapping Fernández-García, E. Wojtak, R. Prada, F. Cervantes-Cota, J. L. Alves, O. Valogiannis, G. Aguilar, J. Ahlen, S. BenZvi, S. Bianchi, D. Brooks, D. Claybaugh, T. de la Macorra, A. Doel, P. Gaztañaga, E. Gontcho, S. Gontcho A Gutierrez, G. Honscheid, K. Ishak, M. Juneau, S. Kirkby, D. Kisner, T. Landriau, M. Guillou, L. Le Levi, M. E. Li, T. S. Manera, M. Meisner, A. Miquel, R. Moustakas, J. Muñoz-Gutiérrez, A. Nadathur, S. Percival, W. J. Pérez-Ràfols, I. Rossi, G. Sanchez, E. Schubnell, M. Seo, H. Sprayberry, D. Tarlé, G. Weaver, B. A. Zou, H. Cosmology and Nongalactic Astrophysics We explore transformations of the Friedman-Lemaître-Robertson-Walker (FLRW) metric and cosmological parameters that align with observational data, aiming to gain insights into potential extensions of standard cosmological models. We modify 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 constrain both the CSF and cosmological parameters through a Markov Chain Monte Carlo approach. 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 have 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.
title	Missing Components in ΛCDM from DESI Y1 BAO Measurements: Insights from Redshift Remapping
topic	Cosmology and Nongalactic Astrophysics
url	https://arxiv.org/abs/2503.22469