Nonminimal coupling of perfect fluids to curvature

Details Nonminimal coupling of perfect fluids to curvature Nonminimal coupling of perfect fluids to curvature

2008-06-27

arxiv.org/abs/0806.4434v2

Phys.Rev.D78:064036,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

6 pages. V2: minor changes and references added

Scientific paper

10.1103/PhysRevD.78.064036

In this work, we consider different forms of relativistic perfect fluid Lagrangian densities, that yield the same gravitational field equations in General Relativity. A particularly intriguing example is the case with couplings of the form $[1+f_2(R)]{\cal L}_m$, 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 ${\cal L}_m = p$, 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 ${\cal L}_m$ 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.

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