Integrability of the Manakov--Santini hierarchy

Details Integrability of the Manakov--Santini hierarchy Integrability of the Manakov--Santini hierarchy

2009-10-13

arxiv.org/abs/0910.2400v1

Nonlinear Sciences

Exactly Solvable and Integrable Systems

Scientific paper

The first example of the so-called "coupled" integrable hydrodynamic chain is presented. Infinitely many commuting flows are derived. Compatibility conditions of the first two of them lead to the remarkable Manakov--Santini system. Integrability of this four component three dimensional quasilinear system of the first order as well as the coupled hydrodynamic chain is proved by the method of hydrodynamic reductions. In comparision with a general case considered by E.V. Ferapontov and K.R. Khusnutdinova, in this degenerate case N component hydrodynamic reductions are parameterized by N+M arbitrary functions of a single variable, where M is a number of branch points of corresponding Riemann surface. These hydrodynamic reductions also are written as symmetric hydrodynamic type systems. New classes of particular solutions are found.

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