Linear and nonlinear instabilities in unified dark energy models

• Tipo: Artigo em Revista Científica Internacional
• Data: 2008

Autores

Avelino, PP (Autor) FCUP; Beca, LMG (Autor) Outra; Martins, CJAP (Autor) FCUP

Revista

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

Vol. 77

ISSN: 1550-7998

Editora: American Physical Society

Indexação

ISI Web of Knowledge - 29 Citações

Scopus - 30 Citações

Outras Informações

ID Authenticus: P-004-1BF

DOI: 10.1103/physrevd.77.063515

Abstract (EN): We revisit the paradigm of unified dark energy discussing in detail the averaging problem in this type of scenario, highlighting the need for a full nonlinear treatment. We also address the question of if and how models with one or several dark fluids can be observationally distinguished. Simpler and physically clearer derivations of some key results, most notably on the relation between the generalized Chaplygin gas and the standard (Lambda CDM) "concordance'' model and on a Jeans-type small-scale instability of some coupled dark energy/dark matter models are presented.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 6