The Cauchy problem and integrability of a modified Euler-Poisson equation

Details The Cauchy problem and integrability of a modified Euler-Poisson equation The Cauchy problem and integrability of a modified Euler-Poisson equation

2005-01-18

arxiv.org/abs/math/0501279v2

Mathematics

Analysis of PDEs

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Scientific paper

We prove that the periodic initial value problem for a modified Euler-Poisson equation is well-posed for initial data in $H^{s} (T^{m})$ when $s>m/2+2$ and we improve the Sobolev index to $s>3/2$ for $m=1$. We also study the analytic regularity of this problem and prove a Cauchy-Kowalevski type theorem. After presenting a formal derivation of the equation on the semidirect product space $ Diff \ltimes C^{\infty}(\tor)$ as a Hamiltonian equation, we concentrate to one space dimension ($m=1$) and show that the equation is bihamiltonian.

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