Reconstructing the dark energy equation of state with varying couplings

• Tipo: Artigo em Revista Científica Internacional
• Data: 2006

Autores

Avelino, PP (Autor) FCUP; Martins, CJAP (Autor) Outra; Nunes, NJ (Autor) Outra; Olive, KA (Autor) Outra

Revista

Título: Physical Review D - Particles, Fields, Gravitation and Cosmology

Vol. 74

ISSN: 1550-7998

Editora: American Physical Society

Indexação

ISI Web of Knowledge - 65 Citações

Scopus - 63 Citações

Outras Informações

ID Authenticus: P-004-H00

DOI: 10.1103/physrevd.74.083508

Abstract (EN): We revisit the idea of using varying couplings to probe the nature of dark energy, in particular, by reconstructing its equation of state. We show that for the class of models studied this method can be far superior to the standard methods (using type Ia supernovae or weak lensing). We also show that the simultaneous use of measurements of the fine-structure constant alpha and the electron-to-proton mass ratio mu allows a direct probe of grand unification scenarios. We present forecasts for the sensitivity of this method, both for the near future and for the next generation of spectrographs-for the latter we focus on the planned CODEX instrument for ESO's Extremely Large Telescope (formerly known as OWL). A high-accuracy reconstruction of the equation of state may be possible all the way up to redshift z similar to 4.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 7