The Degasperis-Procesi equation as a non-metric Euler equation

Details The Degasperis-Procesi equation as a non-metric Euler equation The Degasperis-Procesi equation as a non-metric Euler equation

2009-08-04

arxiv.org/abs/0908.0508v1

Mathematische Zeitschrift 269, 3 (2011) pp 1137-1153

Physics

Mathematical Physics

17 pages

Scientific paper

10.1007/s00209-010-0778-2

In this paper we present a geometric interpretation of the periodic Degasperis-Procesi equation as the geodesic flow of a right invariant symmetric linear connection on the diffeomorphism group of the circle. We also show that for any evolution in the family of $b$-equations there is neither gain nor loss of the spatial regularity of solutions. This in turn allows us to view the Degasperis-Procesi and the Camassa-Holm equation as an ODE on the Fr\'echet space of all smooth functions on the circle.

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