Stability of fixed points in Poisson geometry and higher Lie theory

Abstract

We provide a uniform approach to obtain sufficient criteria for a (higher order) fixed point of a given bracket structure on a manifold to be stable under deformations. Examples of bracket structures include Lie algebroids, Lie $n$-algebroids, singular foliations, Lie bialgebroids, Courant algebroids and Dirac structures in split Courant algebroids admitting a Dirac complement. We show that the stability problems are specific instances of the following problem: given a differential graded Lie algebra $\mathfrak{g}$, a differential graded Lie subalgebra $\mathfrak{h}$ of degreewise finite codimension in $\mathfrak{g}$ and a Maurer-Cartan element $Q\in {\mathfrak{h}}^1$, when are Maurer-Cartan elements near $Q$ in $\mathfrak{g}$ gauge equivalent to elements of ${\mathfrak{h}}^1$? We show that the vanishing of a finite-dimensional cohomology group associated to $\mathfrak{g},\mathfrak{h}$ and $Q$ implies a positive answer to the question above, and therefore implies stability of fixed points of the geometric structures described above. In particular, we recover the stability results of Crainic-Fernandes for zero-dimensional leaves, as well as the stability results for higher order singularities of Dufour-Wade.

arXiv commentFinal version, accepted for publication. 56 pages

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