Onset of the nonlinear regime in unified dark matter models

• Tipo: Artigo em Revista Científica Internacional
• Data: 2004

Autores

Avelino, PP (Autor) FCUP; Beca, LMG (Autor) Outra; de Carvalho, JPM (Autor) FCUP; Martins, CJAP (Autor) Outra; Copeland, EJ (Autor) Outra

Revista

Título: Physical Review D: Particles and fields

Vol. 69

ISSN: 0556-2821

Editora: American Physical Society

Indexação

ISI Web of Knowledge - 43 Citações

Scopus - 47 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Física

Outras Informações

ID Authenticus: P-000-BVZ

DOI: 10.1103/physrevd.69.041301

Abstract (EN): We discuss the onset of the nonlinear regime in the context of unified dark matter models involving a generalized Chaplygin gas. We show that the transition from dark-matter-like to dark-energy-like behavior will never be smooth. In some regions of space the transition will never take place while in others it may happen sooner or later than naively expected. As a result the linear theory used in previous studies may break down late in the matter dominated era even on large cosmological scales. We study the importance of this effect showing that its magnitude depends on the exact form of the equation of state in the low density regime. We expect that our results will be relevant for other unified dark matter scenarios, particularly those where the quartessence candidate is a perfect fluid.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 5