Nonminimal coupling of perfect fluids to curvature

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

Autores

bertolami, o (Autor) Outra; lobo, fsn (Autor) Outra; paramos, j (Autor) Outra

Revista

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

Vol. 78 Nº 103508

ISSN: 1550-7998

Editora: American Physical Society

Indexação

ISI Web of Knowledge - 256 Citações

Scopus - 268 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Física

Outras Informações

ID Authenticus: P-003-WS8

DOI: 10.1103/physrevd.78.064036

Abstract (EN): In this work, we consider different forms of relativistic perfect fluid Lagrangian densities that yield the same gravitational field equations in general relativity (GR). A particularly intriguing example is the case with couplings of the form [1 + f(2()R)] L-m, where R is the scalar curvature, which induces an extra force that depends on the form of the Lagrangian density. It has been found that, considering the Lagrangian density L-m = p, where p is the pressure, the extra-force vanishes. We argue that this is not the unique choice for the matter Lagrangian density, and that more natural forms for L-m do not imply the vanishing of the extra force. Particular attention is paid to the impact on the classical equivalence between different Lagrangian descriptions of a perfect fluid.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 6