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Construction of Einstein metrics by generalized Dehn filling. (English) Zbl 1250.53042

This paper gives a construction of Einstein manifolds through a process similar to Thurston’s Dehn filling.
Starting with a finite volume hyperbolic manifold \((M_{hyp}, g_{hyp})\) of dimension \(n \geq 3\) whose cusps \(N_1, \dots N_p\) are all diffeomorphic to \([0,\infty) \times T^{n-1}\), one cuts out the cusps to obtain a compact manifold whoses boundary is a collection of flat tori \(T_1, \dots, T_p\). By gluing in \(p\) solid tori \(D^2 \times T^{n-1}\) along gluing diffeomorphisms \(\partial(D^2\times T^{n-1}) \rightarrow T_k\), one obtains the manifold \(M_{(\sigma_1, \dots , \sigma_p)}\) where \(\sigma_1, \dots \sigma_p\) are the geodesic representations in \(T_1, \dots, T_p\) of the images of the loop \(S^1 \times \{ \text{pt} \} \subset D^2 \times T^{n-1}\) under the gluing maps.
Theorem. There exists a constant \(L\) depending on \(n\) and \(V\) such that whenever \(\text{Vol}(M_{hyp}) < V \) and \(\text{Length}(\sigma_k)> L\) for all \(k = 1, \dots , p\), then \(M_{(\sigma_1, \dots , \sigma_p)}\) carries an Einstein metric \(g_{(\sigma_1, \dots , \sigma_p)}\). Moreover, the metrics on \(M_{(\sigma_1, \dots , \sigma_p)}\) can be constructed in such a way that as the lengths of the \(\sigma_k\) diverge to \(\infty\), \((M_{(\sigma_1, \dots , \sigma_p)}, g_{(\sigma_1, \dots , \sigma_p)})\) converges to \((M_{hyp}, g_{hyp})\) in the pointed Gromov-Hausdorff sense if the base points are chosen away from the cusps,
A weaker result can be found in an article by M. T. Anderson [J. Differ. Geom. 73, No. 2, 219–261 (2006; Zbl 1100.53039)].

MSC:

53C25 Special Riemannian manifolds (Einstein, Sasakian, etc.)
57N16 Geometric structures on manifolds of high or arbitrary dimension
57M35 Dehn’s lemma, sphere theorem, loop theorem, asphericity (MSC2010)
57R65 Surgery and handlebodies
53C23 Global geometric and topological methods (à la Gromov); differential geometric analysis on metric spaces

Citations:

Zbl 1100.53039

References:

[1] Anderson, M.: Some results on the structure of conformally compact Einstein metrics. arXiv:0402198 (2004)
[2] Anderson, M.: Dehn filling and Einstein metrics in higher dimensions. J. Differential Geom. 73, 219-261 (2006) · Zbl 1100.53039
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