A symplectic non-squeezing theorem for BBM equation
A symplectic non-squeezing theorem for BBM equation
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BBM方程的辛非挤压定理
DOI:
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发表时间:
2010
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通讯作者:
David Roumegoux
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作者:
David Roumegoux
We study the initial value problem for the BBM equation: $$left{egin{array}{l} u_t+u_x+uu_x-u_{txx}=0 qquad xin T, t in R u(0,x)=u_0(x) end{array}
ight. .$$ We prove that the BBM equation is globaly well-posed on $H^s(T)$ for $sgeq0$ and a symplectic non-squeezing theorem on $H^{1/2}(T)$. That is to say the flow-map $u_0 mapsto u(t)$ that associates to initial data $u_0 in H^{1/2}(T)$ the solution $u$ cannot send a ball into a symplectic cylinder of smaller width.