The variational principle, conformal and disformal transformations, and the degrees of freedom
Alexey Golovnev
Abstract
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.
Topics & Concepts
Conformal mapKinetic termScalar (mathematics)Variational principleContext (archaeology)Degrees of freedom (physics and chemistry)Conformal symmetryTheoretical physicsApplied mathematicsMathematicsPhysicsClassical mechanicsMathematical physicsScalar fieldMathematical analysisQuantum mechanicsGeometryBiologyPaleontologyCosmology and Gravitation TheoriesBlack Holes and Theoretical PhysicsGeophysics and Gravity Measurements