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arXiv 0902.3300math.DG
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整Lipschitz图的拉格朗日中曲率流

Lagrangian Mean Curvature flow for entire Lipschitz graphs

Albert Chau, Jingyi Chen, Weiyong He

摘要:

研究了具有Lipschitz连续初值的整拉格朗日图的中曲率流。假设$\R^{2n}$中初始整Lagrangian图的Lipschitz范数有一定的界,我们证明了Lagrangian势的抛物型方程\eqref{PMA}有一个长时间解,该解对所有正时间是光滑的,并且满足远离时间的一致估计$t=0$ .特别地,在中曲率流下,图立即变得光滑,并且解始终存在,使得第第二基本型在图上均匀地衰减为0,如$t\to \infty$。我们对Lipschitz范数的假设等价于拉格朗日势$u$在$L^\infty$中一致凸且Hessian有界的假设。我们应用这个结果证明了平移孤子的Bernstein型定理,即如果这样的整个拉格朗日图是一个光滑的平移孤子,那么它一定是一个平坦的平面。我们还证明了在额外的条件下的进化图的收敛性。

英文摘要:

We consider the mean curvature flow of entire Lagrangian graphs with Lipschitz continuous initial data. Assuming only a certain bound on the Lipschitz norm of an initial entire Lagrangian graph in $\R^{2n}$, we show that the parabolic equation \eqref{PMA} for the Lagrangian potential has a longtime solution which is smooth for all positive time and satisfies uniform estimates away from time $t=0$. In particular, under the mean curvature flow the graph immediately becomes smooth and the solution exists for all time such that the second fundamental form decays uniformly to 0 on the graph as $t\to \infty$. Our assumption on the Lipschitz norm is equivalent to the assumption that the underlying Lagrangian potential $u$ is uniformly convex with its Hessian bounded in $L^\infty$. We apply this result to prove a Bernstein type theorem for translating solitons, namely that if such an entire Lagrangian graph is a smooth translating soliton, then it must be a flat plane. We also prove convergence of the evolving graphs under additional conditions.

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