Diffeomorphisms of odd-dimensional discs, glued into a manifold
2021
For a compact $(2n+1)$-dimensional smooth manifold, let $\mu_M : B Diff_\partial (D^{2n+1}) \to B Diff (M)$ be the map that is defined by extending diffeomorphisms on an embedded disc by the identity.
By a classical result of Farrell and Hsiang, the rational homotopy groups and the rational homology of $ B Diff_\partial (D^{2n+1})$ are known in the concordance stable range.
We prove two results on the behaviour of the map $\mu_M$ in the concordance stable range. Firstly, it is \emph{injective} on rational homotopy groups, and secondly, it is \emph{trivial} on rational homology, if $M$ contains sufficiently many embedded copies of $S^n\times S^{n+1} \setminus int(D^{2n+1})$.
The homotopical statement is probably not new and follows from the theory of smooth torsion invariants. The homological statement relies on work by Botvinnik and Perlmutter on diffeomorphism of odd-dimensional manifolds.
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