Nonminimal coupling of perfect fluids to curvature

By O. Bertolami, Francisco S. N. Lobo, J. P'aramos. 2008

216 citations recorded by the source corpus.

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{sub 2}(R)]L{sub 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{sub 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{sub 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.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/f1951111be19e16e2054260d7c0c46492b2630b4

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Citations in the corpus

Stellar structure models in modified theories of gravity: Lessons and challenges (2019, methodology): “Models with non-minimal curvature-matter couplings have been the subject of recent investigations in extensions of GR [342].”
Hybrid Metric-Palatini Gravity (2015, background): “Other extensions of the f(R) framework modify the coupling of matter to gravity by defining an action which depends linearly [39] or nonlinearly upon the matter Lagrangian [40–47], or its trace [48–50].”