Nonminimal coupling of perfect fluids to curvature

• Type: Article in International Scientific Journal
• Date: 2008

Authors

bertolami, o (Author) Other; lobo, fsn (Author) Other; paramos, j (Author) Other

Journal

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

Vol. 78 No. 103508

ISSN: 1550-7998

Publisher: American Physical Society

Indexing

ISI Web of Knowledge - 256 Citations

Scopus - 268 Citations

Scientific classification

FOS: Natural sciences > Physical sciences

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6