## Journal of Differential Geometry

- J. Differential Geom.
- Volume 93, Number 2 (2013), 327-353.

### The Smale conjecture for Seifert fibered spaces with hyperbolic base orbifold

Darryl McCullough and Teruhiko Soma

#### Abstract

Let $M$ be a closed orientable 3-manifold admitting an $\mathbb{H}^2 \times \mathbb{R}$ or $\widetilde{\mathrm{SL}_2}(\mathbb{R})$ geometry, or equivalently a Seifert fibered space with a hyperbolic base 2-orbifold. Our main result is that the connected component of the identity map in the diffeomorphism group $\mathrm{Diff}(M)$ is either contractible or homotopy equivalent to $S^1$, according as the center of $\pi_1(M)$ is trivial or infinite cyclic. Apart from the remaining case of non-Haken infranilmanifolds, this completes the homeomorphism classifications of $\mathrm{Diff}(M)$ and of the space of Seifert fiberings $\mathrm{SF}(M)$ for compact orientable aspherical 3-manifolds. We also prove that when $M$ has an $\mathbb{H}^2 \times \mathbb{R}$ or $\widetilde{\mathrm{SL}_2}(\mathbb{R})$ geometry and the base orbifold has underlying manifold the 2-sphere with three cone points, the inclusion $\mathrm{Isom}(M) \to \mathrm{Diff}(M)$ is a homotopy equivalence.

#### Article information

**Source**

J. Differential Geom., Volume 93, Number 2 (2013), 327-353.

**Dates**

First available in Project Euclid: 25 February 2013

**Permanent link to this document**

https://projecteuclid.org/euclid.jdg/1361800869

**Digital Object Identifier**

doi:10.4310/jdg/1361800869

**Mathematical Reviews number (MathSciNet)**

MR3024309

**Zentralblatt MATH identifier**

1277.57016

#### Citation

McCullough, Darryl; Soma, Teruhiko. The Smale conjecture for Seifert fibered spaces with hyperbolic base orbifold. J. Differential Geom. 93 (2013), no. 2, 327--353. doi:10.4310/jdg/1361800869. https://projecteuclid.org/euclid.jdg/1361800869