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arXiv 0810.5478math.GTmath.DG
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PL-流形的复杂性

Complexity of PL-manifolds

Bruno Martelli

摘要:

我们将Matveev关于3-流形的复杂性推广到任意维数的PL紧流形,并研究了它的性质。流形的复杂度是指在一个简单的脊中顶点的最小数目。我们研究了这个量如何在最常见的拓扑操作(处理添加,有限覆盖,钻孔和手术的领域,产品,连接的总和)和它的关系与一些几何不变量(格罗莫夫规范,球形体积,体积熵,收缩常数)。复杂性区分了一些同伦等价流形,并且在所有闭非球面流形上(特别是在具有非正截面曲率的流形上)是正的。对于任何给定的复杂性,都有许多闭双曲流形。另一方面,存在许多复杂性为零的闭4-流形(没有3-柄的流形,2-流形体的对偶,无穷多个奇异K3曲面,具有任意基本群的辛流形)。

英文摘要:

We extend Matveev's complexity of 3-manifolds to PL compact manifolds of arbitrary dimension, and we study its properties. The complexity of a manifold is the minimum number of vertices in a simple spine. We study how this quantity changes under the most common topological operations (handle additions, finite coverings, drilling and surgery of spheres, products, connected sums) and its relations with some geometric invariants (Gromov norm, spherical volume, volume entropy, systolic constant). Complexity distinguishes some homotopically equivalent manifolds and is positive on all closed aspherical manifolds (in particular, on manifolds with non-positive sectional curvature). There are finitely many closed hyperbolic manifolds of any given complexity. On the other hand, there are many closed 4-manifolds of complexity zero (manifolds without 3-handles, doubles of 2-handlebodies, infinitely many exotic K3 surfaces, symplectic manifolds with arbitrary fundamental group).

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