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, □ R, … , □ kR) have the form of perfect fluids in the field equations. This statement definitively allows to deal with dark energy fluids as curvature effects.

Cosmological perfect fluids in higher-order gravity / S. Capozziello, C.A. Mantica, L.G. Molinari. - In: GENERAL RELATIVITY AND GRAVITATION. - ISSN 0001-7701. - 52:4(2020 Apr), pp. 36.1-36.9. [10.1007/s10714-020-02690-2]

Cosmological perfect fluids in higher-order gravity

C.A. Mantica;L.G. Molinari
2020

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, □ R, … , □ kR) have the form of perfect fluids in the field equations. This statement definitively allows to deal with dark energy fluids as curvature effects.
Cosmology; Higher-order gravity; Perfect fluids
Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici
apr-2020
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/736194
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