Cosmological perfect fluids in higher-order gravity

被引：32
|
作者：
Capozziello, Salvatore [1 ,2 ,3 ]
Mantica, Carlo Alberto [4 ,5 ]
Molinari, Luca Guido [5 ,6 ]
机构：
[1] Univ Napoli Federico II, Dipartimento Fis E Pancini, Naples, Italy
[2] Univ Monte S Angelo, Sez Napoli, Ist Nazl Fis Nucl, Edificio G,Via Cinthia, I-80126 Naples, Italy
[3] Tomsk State Univ Control Syst & Radioelect TUSUR, Lab Theoret Cosmol, Tomsk 634050, Russia
[4] IIS Lagrange, Via L Modignani 65, I-20161 Milan, Italy
[5] Ist Nazl Fis Nucl, Sez Milano, Via Celoria 16, I-20133 Milan, Italy
[6] Univ Milan, Dipartimento Fis A Pontremoli, Milan, Italy
来源：
GENERAL RELATIVITY AND GRAVITATION | 2020年 / 52卷 / 04期
关键词：
Higher-order gravity; Cosmology; Perfect fluids; 6TH-ORDER GRAVITY; EXTENDED THEORIES; INFLATION; MODELS;
D O I：
10.1007/s10714-020-02690-2
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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, horizontal ellipsis, kR)\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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页数：9
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