Early time solution as an alternative to the late time evolving dark energy with DESI DR2 BAO
Recently the Dark Energy Spectroscopic Instrument (DESI) provided constraints on the expansion history from their Data Release 2. The DESI baryon acoustic oscillation measurements are well described by a flat ¿¿CDM model, but the preferred parameters are in mild (2.3¿¿) tension with those determined...
| Autores: | , , , , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/455190 |
| Acceso en línea: | https://hdl.handle.net/2117/455190 https://dx.doi.org/10.1103/xtql-wh3h |
| Access Level: | acceso abierto |
| Palabra clave: | Baryon acoustic oscillations Cosmology Dark energy Large scale structure of the Universe Àrees temàtiques de la UPC::Física::Astronomia i astrofísica |
| Sumario: | Recently the Dark Energy Spectroscopic Instrument (DESI) provided constraints on the expansion history from their Data Release 2. The DESI baryon acoustic oscillation measurements are well described by a flat ¿¿CDM model, but the preferred parameters are in mild (2.3¿¿) tension with those determined from the cosmic microwave background. 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 O¿, higher ¿0, ¿¿ and ¿8 in contrast to the late-time solutions. We discuss the current status and near-future prospects for distinguishing amongst these solutions. |
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