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Cosmological perfect fluids in higher-order gravity

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arxiv 1908.10176 v1 pith:6QX5O4JB submitted 2019-08-27 gr-qc hep-th

Salvatore Capozziello , Carlo Alberto Mantica , Luca Guido Molinari This is my paper
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keywords fluidshigher-orderperfectrobertson-walkersquareallowscorrectionscosmological
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abstract

We prove that in Robertson-Walker space-times (and in generalized Robertson-Walker spacetimes of dimension greater than 3 with divergence-free Weyl tensor) all higher-order gravitational corrections of the Hilbert-Einstein Lagrangian density $F(R,\square R, ... , \square^k R)$ have the form of perfect fluids in the field equations. This statement definitively allows to deal with dark energy fluids as curvature effects.

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