2003/03/04 by Sawa Manoff, Manoff, Sawa
Earth and Planetary Sciences · Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Geophysics and Gravity Measurements #gr-qc
paper · pdf · doi:10.48550/arxiv.gr-qc/0303015
46 pages, LaTeX
arxiv created 2003/03/04 · arxiv updated 2009/11/30
The theory of perfect fluids is reconsidered from the point of view of a covariant Lagrangian theory. It has been shown that the Euler-Lagrange equations for a perfect fluid could be found in spaces with affine connections and metrics from an unconstrained variational principle by the use of the method of Lagrangians with covariant derivatives (MLCD) and additional conditions for reparametrizations of the proper time of the mass elements (particles) of the perfect fluid. The last conditions are not related to the variational principle and are not considered as constraints used in the process of variations. The application of the whole structure of a Lagrangian theory with an appropriate choice of Lagrangian invariant as the pressure of the fluid shows that the Euler-Lagrange equations with their corresponding energy-momentum tensors lead to Navier-Stokes' equation identical with the Euler equation for a perfect fluid in a space with one affine connection and metrics. The Navier-Stokes equations appear as higher order equations with respect to the Euler-Lagrange equations.