Mimetic Horava gravity

被引：12
|
作者：
Chamseddine, Ali H. [1 ,2 ]
Mukhanov, Viatcheslav [2 ,3 ,4 ]
Russ, Tobias B. [2 ]
机构：
[1] Amer Univ Beirut, Phys Dept, Beirut, Lebanon
[2] Ludwig Maxmillians Univ, Theoret Phys, Theresienstr 37, D-80333 Munich, Germany
[3] MPI Phys, Foehringer Ring 6, D-80850 Munich, Germany
[4] Korea Inst Adv Study, Sch Phys, Seoul 02455, South Korea
来源：
PHYSICS LETTERS B | 2019年 / 798卷
基金：
美国国家科学基金会;
关键词：
D O I：
10.1016/j.physletb.2019.134939
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We show that the scalar field of mimetic gravity could be used to construct diffeomorphism invariant models that reduce to Ho.rava gravity in the synchronous gauge. The gradient of the mimetic field provides a timelike unit vector field that allows to define a projection operator of four-dimensional tensors to three-dimensional spatial tensors. Conversely, it also enables us to write quantities invariant under space diffeomorphisms in fully covariant form without the need to introduce new propagating degrees of freedom. (C) 2019 The Authors. Published by Elsevier B.V.
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页数：3
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