The variational principle, conformal and disformal transformations, and the degrees of freedom
The variational principle, conformal and disformal transformations, and the degrees of freedom
复制标题
变分原理、共形和不形变以及自由度
DOI：
10.1063/5.0120079
复制
发表时间：
2022
影响因子：
1.3
通讯作者：
A. Golovnev
中科院分区：
文献类型：
--
作者：
A. Golovnev
在各种修正的引力理论的背景下，保形变换和非形变变换现在被非常深入地研究。特别是，它们中的一些特殊类可以用来构造模拟暗物质模型。最近，有研究表明，如果不是几乎所有的这种类型的变换，当系数依赖于标量动力学项时，可以产生具有拟态性质的新的解。本文的目的是在变分原理的水平上解释它是如何工作的，并表达对这些模型的可行性的一些担忧。
Conformal and disformal transformations are now being very intensively studied in the context of various modified gravity theories. In particular, some special classes of them can be used for constructing mimetic dark matter models. Recently, it has been shown that many more transformations of this type, if not virtually all of them when the coefficients depend on the scalar kinetic term, can produce new solutions with mimetic properties. The aim of this paper is to explain how it works at the level of the variational principle, and to express some worries about the viability of these models.
影响因子：
5.4
作者：
Chamseddine, Ali H.;Mukhanov, Viatcheslav
通讯作者：
Mukhanov, Viatcheslav