论文标题
各种原则，形式和异常转变以及自由度
The Variational principle, Conformal and Disformal transformations, and the degrees of freedom
论文作者
论文摘要
现在，在各种修饰的重力理论的背景下，对共形和异形转化进行了深入的研究。特别是，其中一些特殊类可用于构建模拟暗物质模型。最近，已经表明，当系数取决于标量动力学术语时，这种类型的更多转换（即使不是几乎全部）可以产生具有模拟属性的新溶液。本文的目的是解释其在变异原理级别上的工作原理，并表达对这些模型生存能力的一些担忧。
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 viability of these models.
