Updated cosmological constraints on axion dark energy with DESI
We present updated constraints on the parameters of an axion dark energy model, for which we took into account the properties of its characteristic potential and its full cosmological evolution. We show that the values of the axion parameters appear sufficiently constrained by the data, including th...
| Autores: | , , , , , , , , , |
|---|---|
| Tipo de documento: | artigo |
| Data de publicação: | 2025 |
| País: | España |
| Recursos: | Universitat Politècnica de Catalunya (UPC) |
| Repositório: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglês |
| OAI Identifier: | oai:upcommons.upc.edu:2117/451558 |
| Acesso em linha: | https://hdl.handle.net/2117/451558 https://dx.doi.org/10.1103/6pqs-xjln |
| Access Level: | Acceso aberto |
| Palavra-chave: | Cosmological parameters Cosmology Dark energy Àrees temàtiques de la UPC::Física::Astronomia i astrofísica |
| Resumo: | We present updated constraints on the parameters of an axion dark energy model, for which we took into account the properties of its characteristic potential and its full cosmological evolution. We show that the values of the axion parameters appear sufficiently constrained by the data, including the latest DESI DR1, and are consistent with the theoretical expectations of a field mass in the ultralight regime log(2/eV)≃−32.60±0.12 , and an effective energy scale close to the reduced Planck energy log(/Pl)≃−0.28±0.19 . Our results also support the idea of dynamical dark energy, although Bayesian evidence still favors the phenomenological dark energy model 0 over the axion dark energy, with the Bayes factor indicating moderate and weak strength of the evidence, respectively, when the models are compared to the cosmological constant Λ . However, the results suggest that axion dark energy remains a well-motivated model and its parameters may be better constrained if the upcoming DESI data show further evidence for dynamical dark energy. |
|---|