Fluid nature constrains Horndeski gravity

被引：12

作者：

Miranda, Marcello ^{[1
,2
]}

Vernieri, Daniele ^{[1
,2
,3
]}

Capozziello, Salvatore ^{[1
,2
,3
]}

Faraoni, Valerio ^{[4
]}

机构：

[1] Scuola Super Meridionale, Largo San Marcellino 10, I-80138 Naples, Italy

[2] Compl Univ Monte S Angelo, Ist Nazl Fis Nucleare, Sez Napoli, Edificio G, Via Cinthia, I-80126 Naples, Italy

[3] Univ Napoli Federico II, Compl Univ Monte S Angelo, Dipartimento Fis E Pancini, Edificio G, Via Cinthia, I-80126 Naples, Italy

[4] Bishops Univ, Dept Phys & Astron, 2600 Coll St, Sherbrooke, PQ J1M 1Z7, Canada

来源：

GENERAL RELATIVITY AND GRAVITATION | 2023年 / 55卷 / 07期

关键词：

Modified gravity; Cosmology; Effective fluids; THERMODYNAMICS;

D O I：

10.1007/s10714-023-03128-1

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The elusive physical nature of Horndeski gravity is elucidated in a new approach depicting this class of theories as a dissipative effective fluid. Requiring the constitutive equations of the latter to be those of a Newtonian fluid restricts the theory to only two disconnected subclasses of "viable" Horndeski gravity. Therefore, a stress-energy tensor of the Horndeski effective fluid, linear in the first derivatives of the fluid's 4-velocity, is a sufficient condition for gravitational waves to propagate at light speed. All other Horndeski theories correspond to exotic non-Newtonian effective fluids. The two linear Horndeski classes are studied in the framework of first-order thermodynamics of viscous fluids, which further constrains the functional form of the theory.

引用

页数：25

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