dorsal/arxiv
View SchemaLaplace transformations of hydrodynamic type systems in Riemann invariants: periodic sequences
| Authors | E. V. Ferapontov |
|---|---|
| Categories | |
| ArXiv ID | solv-int/9705017 |
| URL | https://arxiv.org/abs/solv-int/9705017 |
| DOI | 10.1088/0305-4470/30/19/023 |
Abstract
The conserved densities of hydrodynamic type system in Riemann invariants satisfy a system of linear second order partial differential equations. For linear systems of this type Darboux introduced Laplace transformations, generalising the classical transformations in the scalar case. It is demonstrated that Laplace transformations can be pulled back to the transformations of the corresponding hydrodynamic type systems. We discuss periodic Laplace sequences of with the emphasize on the simplest nontrivial case of period 2. For 3-component systems in Riemann invariants a complete discription of closed quadruples is proposed. They turn to be related to a special quadratic reduction of the (2+1)-dimensional 3-wave system which can be reduced to a triple of pairwize commuting Monge-Ampere equations. In terms of the Lame and rotation coefficients Laplace transformations have a natural interpretation as the symmetries of the Dirac operator, associated with the (2+1)-dimensional n-wave system. The 2-component Laplace transformations can be interpreted also as the symmetries of the (2+1)-dimensional integrable equations of Davey-Stewartson type. Laplace transformations of hydrodynamic type systems originate from a canonical geometric correspondence between systems of conservation laws and line congruences in projective space.
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"abstract": "The conserved densities of hydrodynamic type system in Riemann invariants\nsatisfy a system of linear second order partial differential equations. For\nlinear systems of this type Darboux introduced Laplace transformations,\ngeneralising the classical transformations in the scalar case. It is\ndemonstrated that Laplace transformations can be pulled back to the\ntransformations of the corresponding hydrodynamic type systems. We discuss\nperiodic Laplace sequences of with the emphasize on the simplest nontrivial\ncase of period 2. For 3-component systems in Riemann invariants a complete\ndiscription of closed quadruples is proposed. They turn to be related to a\nspecial quadratic reduction of the (2+1)-dimensional 3-wave system which can be\nreduced to a triple of pairwize commuting Monge-Ampere equations. In terms of\nthe Lame and rotation coefficients Laplace transformations have a natural\ninterpretation as the symmetries of the Dirac operator, associated with the\n(2+1)-dimensional n-wave system. The 2-component Laplace transformations can be\ninterpreted also as the symmetries of the (2+1)-dimensional integrable\nequations of Davey-Stewartson type. Laplace transformations of hydrodynamic\ntype systems originate from a canonical geometric correspondence between\nsystems of conservation laws and line congruences in projective space.",
"arxiv_id": "solv-int/9705017",
"authors": [
"E. V. Ferapontov"
],
"categories": [
"solv-int",
"nlin.SI"
],
"doi": "10.1088/0305-4470/30/19/023",
"title": "Laplace transformations of hydrodynamic type systems in Riemann invariants: periodic sequences",
"url": "https://arxiv.org/abs/solv-int/9705017"
},
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