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arXiv math/0309193math.DG
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PU(m,1)的调和映射与非均匀格的表示

Harmonic maps and representations of non-uniform lattices of PU(m,1)

Vincent Koziarz, Julien Maubon

摘要:

我们研究了PU(m,1)到PU(n,1)的格的表示.证明了如果一个表示是约化的,且m至少为2,则存在从复双曲m-空间到复双曲n-空间的有限能量调和等变映射.这使我们能够给出M. Burger和A.约齐我们还定义了一个新的不变量与PU(n,1)的非均匀格的PU(1,1),更一般的有限拓扑型和负欧拉示性数的可定向曲面的基本群的表示。我们证明了这个不变量是有界的常数只依赖于表面的欧拉示性数,我们给出了一个完整的表征表示与极大不变量,从而推广了D。托莱多的均匀晶格。

英文摘要:

We study representations of lattices of PU(m,1) into PU(n,1). We show that if a representation is reductive and if m is at least 2, then there exists a finite energy harmonic equivariant map from complex hyperbolic m-space to complex hyperbolic n-space. This allows us to give a differential geometric proof of rigidity results obtained by M. Burger and A. Iozzi. We also define a new invariant associated to representations into PU(n,1) of non-uniform lattices in PU(1,1), and more generally of fundamental groups of orientable surfaces of finite topological type and negative Euler characteristic. We prove that this invariant is bounded by a constant depending only on the Euler characteristic of the surface and we give a complete characterization of representations with maximal invariant, thus generalizing the results of D. Toledo for uniform lattices.

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