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arXiv 0710.4437math.ATmath.GT
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曲面上Morse函数轨道的同伦维数

Homotopy dimension of orbits of Morse functions on surfaces

Sergiy Maksymenko

摘要:

设$f$是紧致曲面M上的一个实值或圆值Morse函数,它恰好具有$n>0$临界点.用$O$表示$f$相对于$M$的单同态群的右作用的轨道。我们证明了$O$的连通分支具有有限维CW-复形的同伦类型。实际上,这些连通分支同伦等价于$M$内部的$n$阶位形空间的某个覆盖空间。由此得到$O$的基本群是$M$的第$n$个辫群的子群.

英文摘要:

Let $f$ be a real- or circle-valued Morse function on a compact surface M having exactly $n>0$ critical points. Denote by $O$ the orbit of $f$ with respect to the right action of the group of diffeomorphisms of $M$. We show that the connected components of $O$ have the homotopy type of a finite-dimensional CW-complex. Actually, these connected components are homotopy equivalent to a certain covering space of the $n$-th configuration space of the interior of $M$. As a consequence we obtain that the fundamental group of $O$ is a subgroup of the $n$-th braid group of $M$.

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