Journal of Lie Theory 33 (2023), No. 3, 925--952
Copyright Heldermann Verlag 2023
On the Universal L∞-Algebroid of Linear Foliations
Karandeep J. Singh
Dept. of Mathematics, Katholieke Universiteit Leuven, Belgium
karandeep.singh@kuleuven.be
[Abstract-pdf]
We compute an $L_\infty$-algebroid structure on a projective resolution of some classes of singular foliations on a vector space $V$ induced by the linear action of some Lie subalgebras of $\mathfrak{gl}(V)$. This $L_\infty$-algebroid provides invariants of the singular foliations, and also provides a constant-rank replacement of the singular foliation. The computation consists of first constructing a projective resolution of the foliation induced by the linear action of the Lie subalgebra $\mathfrak{g}\subset \mathfrak{gl}(V)$, and then computing the $L_\infty$-algebroid structure. We then generalize these constructions to a vector bundle $E$, where the role of the origin is now taken by the zero section $L$.\\ We then show that the fibers over a singular point of a projective resolution of any singular foliation can be computed directly from the foliation, without needing the projective resolution. For linear foliations, we also provide a way to compute the action of the isotropy Lie algebra in the origin on these fibers directly from the foliation.
Keywords: Singular foliations, L-infinity-algebroids, projective resolutions.
MSC: 22E45, 13D02, 17B55.
[ Fulltext-pdf (217 KB)] for subscribers only.