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

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发表时间:
2010
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通讯作者:
David Roumegoux
David Roumegoux
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作者:
David Roumegoux

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我们研究BBM方程的初值问题:$$left{egin{array}{l} u_t+u_x+uu_x-u_{txx}=0 qquad xin T,t in R u(0,x)=u_0(x)end{array} 好的。.$$我们证明了BBM方程在H^s(T)上对sgeq 0是整体适定的,并且在H^{1/2}(T)上是一个辛非压缩定理.也就是说,流映射u_0映射到与H^{1/2}(T)$中的初始数据u_0相关联的u(t)$,解u$不能将球送入更小宽度的辛柱体。
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.