Hydrodynamics, particle relabelling and relativity

Details Hydrodynamics, particle relabelling and relativity Hydrodynamics, particle relabelling and relativity

2011-05-18

arxiv.org/abs/1105.3764v1

Physics

Fluid Dynamics

21 pages

Scientific paper

Using the wave equation as an example, it is shown how to extend the hydrodynamic Lagrangian-picture method of constructing field evolution using a continuum of trajectories to second-order theories. The wave equation is represented through Eulerian-picture models that are distinguished by their Lorentz transformation properties. Introducing the idea of the relativity of the particle label, it is demonstrated how the corresponding trajectory models are compatible with the relativity principle. It is also shown how the Eulerian variational formulation may be obtained by canonical transformation from the Lagrangian picture, and how symmetries in the Lagrangian picture may be used to generate Eulerian conserved charges.

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