The homology of surface diffeomorphism groups and a question of Morita

Bowden, Jonathan

doi:10.1090/S0002-9939-2011-11259-0

The homology of surface diffeomorphism groups and a question of Morita
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Proc. Amer. Math. Soc. 140 (2012), 2543-2549 Request permission

Abstract:

We answer a question posed by Morita concerning the non-trivial- ity of certain secondary characteristic classes for surface bundles. In doing so we are naturally led to show that a form of Harer stability holds for surface diffeomorphism groups in homology of small degree.

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