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arXiv 1806.02895math.AP
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具有平边的数量曲率流

The scalar curvature flow with a flat side

Hyo Seok Jang, Ki-Ahm Lee

摘要:

研究了具有平坦边的紧致凸数量曲率流的近界面行为。在适当的初始条件下,在平坦的一侧,我们表明,界面传播有限的和非退化的速度,直到平坦的一侧消失。然后得到了类压函数的最优导数估计、界面附近曲率的最优衰减估计和Aronson-Bénilan型曲率下界,并由此得到了直到自由边界曲率与最优衰减率之比的Hölder正则性.最后,我们得到了解的短时存在性和全时存在性,光滑到界面。

英文摘要:

We study the near-the-interface behavior of a compact convex scalar curvature flow with a flat side. Under suitable initial conditions on the flat side, we show that the interface propagates with a finite and non-degenerate speed until the flat side vanishes. Then we get optimal derivative estimates of the pressure-like function, optimal decay estimates of curvatures near the interface, and an Aronson-Bénilan-type curvature lower bound, from which we obtain the Hölder regularity of the ratio of the curvature to the optimal decay rate up to the free boundary. In the end, we obtain the short-time and all-time existence of the solution, smooth up to the interface.

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