The sound of DHOST

被引：24

作者：

Babichev, E. ^{[1
,2
]}

Lehebel, A. ^{[1
,3
]}

机构：

[1] Univ Paris Saclay, Univ Paris Sud, CNRS, Lab Phys Theor, F-91405 Orsay, France

[2] Sorbonne Univ, CNRS, UMR7095, Inst Astrophys Paris,GR CO, 98Bis Blvd Arago, F-75014 Paris, France

[3] Univ Nottingham, Sch Phys & Astron, Nottingham NG7 2RD, England

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2018年 / 12期

关键词：

dark energy theory; modified gravity;

D O I：

10.1088/1475-7516/2018/12/027

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We show that, in generic higher-order scalar-tensor theories which avoid the Ostrogradsky instability, the presence of a scalar field significantly modifies the propagation of matter perturbations, even in weakly curved backgrounds. This affects notably the speed of sound in the atmosphere of the Earth. It can also generate instabilities in homogeneous media. We use this to constrain the viable higher-order scalar-tensor models.

引用

页数：11

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