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Early time solution as an alternative to the late time evolving dark energy with DESI DR2 BAO

Fuente: arXiv

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Main Authors:	Chaussidon, E., White, M., de Mattia, A., Gsponer, R., Ahlen, S., Bianchi, D., Brooks, D., Claybaugh, T., Cole, S., Cuceu, A., de la Macorra, A., Doel, P., Ferraro, S., Font-Ribera, A., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. Gontcho A, Gutierrez, G., Guy, J., Hahn, C., Herrera-Alcantar, H. K., Honscheid, K., Ishak, M., Kirkby, D., Kisner, T., Kremin, A., Landriau, M., Guillou, L. Le, Levi, M. E., Miquel, R., Moustakas, J., Niz, G., Percival, W. J., Prada, F., Pérez-Ràfols, I., Ross, A. J., Rossi, G., Sanchez, E., Schlegel, D., Seo, H., Sprayberry, D., Walther, M., Weaver, B. A.
Format:	Preprint
Published:	2025
Subjects:	Cosmology and Nongalactic Astrophysics
Online Access:	Acceder al recurso
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author	Chaussidon, E. White, M. de Mattia, A. Gsponer, R. Ahlen, S. Bianchi, D. Brooks, D. Claybaugh, T. Cole, S. Cuceu, A. de la Macorra, A. Doel, P. Ferraro, S. Font-Ribera, A. Forero-Romero, J. E. Gaztañaga, E. Gontcho, S. Gontcho A Gutierrez, G. Guy, J. Hahn, C. Herrera-Alcantar, H. K. Honscheid, K. Ishak, M. Kirkby, D. Kisner, T. Kremin, A. Landriau, M. Guillou, L. Le Levi, M. E. Miquel, R. Moustakas, J. Niz, G. Percival, W. J. Prada, F. Pérez-Ràfols, I. Ross, A. J. Rossi, G. Sanchez, E. Schlegel, D. Seo, H. Sprayberry, D. Walther, M. Weaver, B. A.
author_facet	Chaussidon, E. White, M. de Mattia, A. Gsponer, R. Ahlen, S. Bianchi, D. Brooks, D. Claybaugh, T. Cole, S. Cuceu, A. de la Macorra, A. Doel, P. Ferraro, S. Font-Ribera, A. Forero-Romero, J. E. Gaztañaga, E. Gontcho, S. Gontcho A Gutierrez, G. Guy, J. Hahn, C. Herrera-Alcantar, H. K. Honscheid, K. Ishak, M. Kirkby, D. Kisner, T. Kremin, A. Landriau, M. Guillou, L. Le Levi, M. E. Miquel, R. Moustakas, J. Niz, G. Percival, W. J. Prada, F. Pérez-Ràfols, I. Ross, A. J. Rossi, G. Sanchez, E. Schlegel, D. Seo, H. Sprayberry, D. Walther, M. Weaver, B. A.
contents	Recently the Dark Energy Spectroscopic Instrument (DESI) provided constraints on the expansion history from their Data Release 2 (DR2). The DESI baryon acoustic oscillation (BAO) measurements are well described by a flat $Λ$CDM model, but the preferred parameters are in mild ($2.3σ$) tension with those determined from the cosmic microwave background (CMB). The DESI collaboration has already explored a variety of solutions to this tension relying on variations in the late-time evolution of dark energy. Here we test an alternative -- the introduction of an ``early dark energy'' (EDE) component. We find that EDE models can alleviate the tension, though they lead to differences in other cosmological parameters that have observational implications. Particularly the EDE models that fit the acoustic datasets prefer lower $Ω_m$, higher $H_0$, $n_s$ and $σ_8$ in contrast to the late-time solutions. We discuss the current status and near-future prospects for distinguishing amongst these solutions.
format	Preprint
id	arxiv_https___arxiv_org_abs_2503_24343
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	Early time solution as an alternative to the late time evolving dark energy with DESI DR2 BAO Chaussidon, E. White, M. de Mattia, A. Gsponer, R. Ahlen, S. Bianchi, D. Brooks, D. Claybaugh, T. Cole, S. Cuceu, A. de la Macorra, A. Doel, P. Ferraro, S. Font-Ribera, A. Forero-Romero, J. E. Gaztañaga, E. Gontcho, S. Gontcho A Gutierrez, G. Guy, J. Hahn, C. Herrera-Alcantar, H. K. Honscheid, K. Ishak, M. Kirkby, D. Kisner, T. Kremin, A. Landriau, M. Guillou, L. Le Levi, M. E. Miquel, R. Moustakas, J. Niz, G. Percival, W. J. Prada, F. Pérez-Ràfols, I. Ross, A. J. Rossi, G. Sanchez, E. Schlegel, D. Seo, H. Sprayberry, D. Walther, M. Weaver, B. A. Cosmology and Nongalactic Astrophysics Recently the Dark Energy Spectroscopic Instrument (DESI) provided constraints on the expansion history from their Data Release 2 (DR2). The DESI baryon acoustic oscillation (BAO) measurements are well described by a flat $Λ$CDM model, but the preferred parameters are in mild ($2.3σ$) tension with those determined from the cosmic microwave background (CMB). The DESI collaboration has already explored a variety of solutions to this tension relying on variations in the late-time evolution of dark energy. Here we test an alternative -- the introduction of an ``early dark energy'' (EDE) component. We find that EDE models can alleviate the tension, though they lead to differences in other cosmological parameters that have observational implications. Particularly the EDE models that fit the acoustic datasets prefer lower $Ω_m$, higher $H_0$, $n_s$ and $σ_8$ in contrast to the late-time solutions. We discuss the current status and near-future prospects for distinguishing amongst these solutions.
title	Early time solution as an alternative to the late time evolving dark energy with DESI DR2 BAO
topic	Cosmology and Nongalactic Astrophysics
url	https://arxiv.org/abs/2503.24343