The Weil-Petersson Kähler form and affine foliations on surfaces

Details The Weil-Petersson Kähler form and affine foliations on surfaces The Weil-Petersson Kähler form and affine foliations on surfaces

2003-06-26

arxiv.org/abs/math/0306370v1

Mathematics

Geometric Topology

24 pages, 7 figures

Scientific paper

The space of broken hyperbolic structures generalizes the Teichm\"uller space of a punctured surface, and the space of projectivized broken measured foliations (equivalently, the space of projectivized affine foliations) generalizes the space of projectivized measured foliations. Just as projectivized measured foliations provide Thurston's boundary for Teichm\"uller space, so too do projectivized broken measured foliations form a boundary for the space of broken hyperbolic structures. In this paper, we naturally extend the Weil-Petersson K\"ahler two-form and the Thurston symplectic form to their broken analogues and prove that the former suitably limits to the latter. The proof in sketch follows earlier work of the authors for measured foliations and depends upon techniques from decorated Teichm\"uller theory, which is also applied here to a further study of broken hyperbolic structures.

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