arXiv math/01060462001-06-25math.DGmath.DSmath.SG

Zeros of closed 1-forms, homoclinic orbits, and Lusternik - Schnirelman theory

Michael Farber

备注：: 34 pages. A refernce added

英文摘要：

In this paper we study topological lower bounds on the number of zeros of closed 1-forms without Morse type assumptions. We prove that one may always find a representing closed 1-form having at most one zero. We introduce and study a generalization $cat(X,ξ)$ of the notion of Lusternik - Schnirelman category, depending on a topological space $X$ and a cohomology class $ξ\in H^1(X;\R)$. We prove that any closed 1-form has at least $cat(X,ξ)$ zeros assuming that it admits a gradient-like vector field with no homoclinic cycles. We show that the number $cat(X,ξ)$ can be estimated from below in terms of the cup-products and higher Massey products. This paper corrects some statements made in my previous papers on this subject.

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