Nonlinear Sciences – Exactly Solvable and Integrable Systems
Scientific paper
2009-08-29
Encyclopedia of Mathematical Physics, vol 4 (2006) pp 12-20. Eds. J.-P. Francoise, G.L. Naber and S.T. Tsou, Oxford: Elsevier
Nonlinear Sciences
Exactly Solvable and Integrable Systems
20 pages, 5 figures
Scientific paper
The peakons discussed here are singular solutions of the dispersionless Camassa-Holm (CH) shallow water wave equation in one spatial dimension. These are reviewed in the context of asymptotic expansions and Euler-Poincar\'e variational principles. The dispersionless CH equation generalizes to the EPDiff equation, whose singular solutions are peakon wave fronts in higher dimensions. The reduction of these singular solutions of CH and EPDiff to canonical Hamiltonian dynamics on lower dimensional sets may be understood, by realizing that their solution ansatz is a momentum map, and momentum maps are Poisson.
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