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arXiv 2602.12809math.DGmath.SG
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K接触形式的分类及其子拉普拉斯算子的谱不变量

Classification of K-contact forms and spectral invariants of their sub-Laplacians

Università degli Studi di Padova(帕多瓦大学)

Eugenio Bellini

AI总结:

本文研究了K接触形式的分类及其子拉普拉斯算子的谱不变量,证明了紧致三维流形上存在此类形式的条件,并与Reeb轨道周期相关联。

摘要:

一个接触形式被称为K接触形式,如果其Reeb向量场在某个黎曼度量下是Killing向量场。本文对三维流形上具有至少一个非周期轨道的K接触形式进行了分类。我们证明,如果紧致三维流形上存在这样的接触形式,则其微分同胚于棱镜空间,并且恰好有两个周期Reeb轨道,其周期具有无理比。我们进一步根据闭Reeb轨道的周期,将这些接触形式分类到全局微分同胚。最后,我们将这些周期与子拉普拉斯算子的谱不变量联系起来,证实了Y. Colin de Verdière的猜想在不规则K接触情况下成立。

英文摘要:

A contact form is called K-contact if its Reeb vector field is Killing with respect to some Riemannian metric. In this paper we classify K-contact forms whose Reeb vector field admits at least one non-periodic orbit, on three-dimensional manifolds. We prove that if a compact three-manifold carries such a contact form, then it is diffeomorphic to a lens space and admits exactly two periodic Reeb orbits, whose periods have irrational ratio. We further classify, up to (global) diffeomorphism, these contact forms in terms of the periods of their closed Reeb orbits. We conclude by relating these periods to spectral invariants of the sub-Laplacian, confirming a conjecture of Y. Colin de Verdière in the irregular K-contact case.

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