Arnold Hydrodynamics Revisited

Details Arnold Hydrodynamics Revisited Arnold Hydrodynamics Revisited

2009-02-25

arxiv.org/abs/0902.4306v1

Mathematics

Analysis of PDEs

CERMICS preprint 353, mai 2007

Scientific paper

The purpose of this paper is to revisit the infinite Lie group theoretical framework of hydrodynamics developped by V. Arnold in 1966. First of all, we extend this approach from the Lie pseudogroup of volume preserving transformations to an arbitrary Lie pseudogroup. Then we prove that, contrary to what could be believed from the work of Arnold which is of a purely analytical nature, the same results can be obtained from a purely formal point of view. Finally, we provide the analogue for both the so-called "body" and "space" dynamical equations. We conclude by showing that even this new approach can be superseded by dynamics on Lie groupoids, along ideas pioneered by the brothers E. and F. Cosserat or H. Weyl at the beginning of the last century, on the condition to change the underlying philosophy.

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