On the mean indices of closed characteristics on dynamically convex star-shaped hypersurfaces in $\mathbb{R}^{2n}$

TL;DR

This paper proves new lower bounds on the number of closed characteristics with irrational mean indices on certain convex hypersurfaces in even-dimensional space, improving previous results especially for odd dimensions.

Contribution

It establishes sharper lower bounds for the count of closed characteristics with irrational mean indices on dynamically convex star-shaped hypersurfaces, extending and refining prior theorems.

Findings

At least loor{rac{n+1}{2}} such characteristics with irrational mean indices when finite.

At least loor{rac{n+1}{2}}+1 characteristics with irrational ratio of mean indices.

Results are sharp for the case n=3.

Abstract

In this paper, we prove that for every dynamically convex compact star-shaped hypersurface $\Sigma\subset\mathbb{R}^{2n}$, there exist at least $\lfloor\frac{n+1}{2}\rfloor$ geometrically distinct closed characteristics possessing irrational mean indices provided the number of geometrically distinct closed characteristics on $\Sigma$ is finite, this improves Theorem 1.3 in \cite{LoZ} of Y. Long and C. Zhu by finding one more closed characteristic possessing irrational mean index when $n$ is odd. Moreover, there exist at least $\lfloor\frac{n+1}{2}\rfloor+1$ geometrically distinct closed characteristics such that the ratio of the mean indices of any two of them is a irrational number provided the number of geometrically distinct closed characteristics on $\Sigma$ is finite, this improves Theorem 1.2 in \cite{HuO} of X. Hu and Y. Ou when $n$ is odd. In particular, these estimates are sharp for $n=3$.