Shortest periodic billiard trajectories in convex bodies

Shortest periodic billiard trajectories in convex bodies
复制标题

凸体中最短周期台球轨迹

DOI:
10.1007/s00039-004-0458-7
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发表时间:
2004
期刊:
Geometric & Functional Analysis GAFA
影响因子:
--
通讯作者:
M. Ghomi
M. Ghomi
中科院分区:
--
文献类型:
--
作者:
M. Ghomi

文献摘要

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我们证明,任何凸体中任何周期台球轨迹的长度总是至少是 K 半径的 4 倍;当 K 的宽度是其半径的两倍时,等式精确成立,例如,K 是中心对称的,在这种情况下,我们证明最短周期轨迹都是弹跳球(2 连杆)轨道。
We show that the length of any periodic billiard trajectory in any convex bodyis always at least 4 times the inradius of K; the equality holds precisely when the width ofKis twice its inradius, e.g.,Kis centrally symmetric, in which case we prove that the shortest periodic trajectories are all bouncing ball (2-link) orbits.