Extended dark energy analysis using DESI DR2 BAO measurements

We conduct an extended analysis of dark energy constraints, in support of the findings of the Dark Energy Spectroscopic Instrument (DESI) second data release cosmology key paper, including DESI data, Planck cosmic microwave background observations, and three different supernova compilations. Using a...

ver descrição completa

Detalhes bibliográficos
Autores: Lodha, Kushal|||0009-0004-2558-5655, Calderon, R., Matthewson, W.L., Shafieloo, Arman|||0000-0001-6815-0337, Ishak, Mustapha|||0000-0002-6024-466X, Pan, Jiaming|||0000-0001-9685-5756, Garcia Quintero, C., Huterer, D., Valogiannis, Georgios|||0000-0003-0805-1470, Pérez Ràfols, Ignasi|||0000-0001-6979-0125
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:2117/449557
Acesso em linha:https://hdl.handle.net/2117/449557
https://dx.doi.org/10.1103/w4c6-1r5j
Access Level:Acceso aberto
Palavra-chave:Baryon acoustic oscillations
Cosmological parameters
Dark energy
Large scale structure of the Universe
Àrees temàtiques de la UPC::Física::Astronomia i astrofísica
Descrição
Resumo:We conduct an extended analysis of dark energy constraints, in support of the findings of the Dark Energy Spectroscopic Instrument (DESI) second data release cosmology key paper, including DESI data, Planck cosmic microwave background observations, and three different supernova compilations. Using a broad range of parametric and nonparametric methods, we explore the dark energy phenomenology and find consistent trends across all approaches, in good agreement with the 0⁢⁢CDM (cold dark matter) key paper results. Even with the additional flexibility introduced by nonparametric approaches, such as binning and Gaussian processes, we find that extending Λ⁢CDM to include a two-parameter ⁡() is sufficient to capture the trends present in the data. Finally, we examine three dark energy classes with distinct dynamics, including quintessence scenarios satisfying ≥−1 , to explore what underlying physics can explain such deviations. The current data indicate a clear preference for models that feature a phantom crossing; although alternatives lacking this feature are disfavored, they cannot yet be ruled out. Our analysis confirms that the evidence for dynamical dark energy, particularly at low redshift ( ≲0.3 ), is robust and stable under different modeling choices.

Registros relacionados