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JOURNAL FUR DIE REINE UND ANGEWANDTE MATHEMATIK
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WALTER DE GRUYTER GMBH
DOI: 10.1515/crelle-2023-0069
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In this paper, we investigate the relationship between the diffeomorphism group and the isometry group of a compact orientable non-Haken 3-manifold X modeled on the Thurston geometry Nil. By combining previous work, we determine the homotopy type of Diff(X) for any compact orientable prime 3-manifold X.
Let X be a compact orientable non-Haken 3-manifold modeled on the Thurston geometry Nil. We show that the diffeomorphism group Diff(X) deformation retracts to the isometry group Isom(X). Combining this with earlier work by many authors, this completes the determination the homotopy type of Diff(X) for any compact, orientable, prime 3-manifold X.
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