Nonlinear Sciences – Exactly Solvable and Integrable Systems
Scientific paper
2003-12-05
Nonlinear Sciences
Exactly Solvable and Integrable Systems
29 pages, 12 figures
Scientific paper
10.1088/0951-7715/17/6/008
We study invariant manifolds of measure-valued solutions of the partial differential equation for geodesic flow of a pressureless fluid. These solutions describe interaction dynamics on lower-dimensional support sets; for example, curves, or filaments, of momentum in the plane. The 2+1 solutions we study are planar generalizations of the 1+1 peakon solutions of Camassa & Holm [1993] for shallow water solitons. As an example, we study the canonical Hamiltonian interaction dynamics of $N$ rotating concentric circles of peakons, whose solution manifold is $2N-$dimensional. Thus, the problem is reduced from infinite dimensions to a finite-dimensional, canonical, invariant manifold. The existence of this reduced solution manifold and many of its properties may be understood, by noticing that it is also the momentum map for the action of diffeomorphisms on the space of curves in the plane. We show both analytical and numerical results.
Holm Darryl D.
Putkaradze Vakhtang
Stechmann Samuel N.
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