Perturbative approach for mass varying neutrinos coupled to the dark sector in the generalized Chaplygin gas scenario

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

Autores

bernardini, ae (Autor) Outra; bertolami, o (Autor) Outra

Revista

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

Vol. 77

ISSN: 1550-7998

Editora: American Physical Society

Indexação

ISI Web of Knowledge - 32 Citações

Scopus - 31 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Física

Outras Informações

ID Authenticus: P-004-0PP

DOI: 10.1103/physrevd.77.083506

Abstract (EN): We suggest a perturbative approach for generic choices for the universe equation of state and introduce a novel framework for studying mass varying neutrinos (MaVaN's) coupled to the dark sector. For concreteness, we examine the coupling between neutrinos and the underlying scalar field associated with the generalized Chaplygin gas (GCG), a unification model for dark energy and dark matter. It is shown that the application of a perturbative approach to MaVaN mechanisms translates into a constraint on the coefficient of a linear perturbation, which depends on the ratio between a neutrino energy dependent term and scalar field potential terms. We quantify the effects on the MaVaN sector by considering neutrino masses generated by the seesaw mechanism. After setting the GCG parameters in agreement with general cosmological constraints, we find that the squared speed of sound in the neutrino-scalar GCG fluid is naturally positive. In this scenario, the model stability depends on previously set up parameters associated with the equation of state of the universe. Our results suggest that the GCG is a particularly suitable candidate for constructing a stable MaVaN scenario.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 11