Nonlinear Sciences – Exactly Solvable and Integrable Systems
Scientific paper
2004-05-27
Journ. Phys. A: Math. Gen. 38 (2005) 637-682.
Nonlinear Sciences
Exactly Solvable and Integrable Systems
64 pages, Latex
Scientific paper
10.1088/0305-4470/38/3/007
We consider the special type of the field-theoretical Symplectic structures called weakly nonlocal. The structures of this type are in particular very common for the integrable systems like KdV or NLS. We introduce here the special class of the weakly nonlocal Symplectic structures which we call the weakly nonlocal Symplectic structures of Hydrodynamic Type. We investigate then the connection of such structures with the Whitham averaging method and propose the procedure of "averaging" of the weakly nonlocal Symplectic structures. The averaging procedure gives the weakly nonlocal Symplectic Structure of Hydrodynamic Type for the corresponding Whitham system. The procedure gives also the "action variables" corresponding to the wave numbers of $m$-phase solutions of initial system which give the additional conservation laws for the Whitham system.
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