Localization of certain odd-dimensional manifolds with torus actions

Abstract

Let a torus $T$ act smoothly on a compact smooth manifold $M$. If the rational equivariant cohomology $H_T^{\ast }(M)$ is a free $H_T^{\ast }(pt)$-module, then according to the Chang-Skjelbred Lemma, it can be determined by the $1$-skeleton consisting of the $T$-fixed points and $1$-dimensional $T$-orbits of $M$. When $M$ is an even-dimensional, orientable manifold with 2-dimensional 1-skeleton, Goresky, Kottwitz and MacPherson gave a graphic description of the equivariant cohomology. In this paper, first we revisit the even-dimensional GKM theory and introduce a notion of GKM covering, then we consider the case when $M$ is an odd-dimensional, possibly non-orientable manifold with $3$-dimensional $1$-skeleton, and give a graphic description of its equivariant cohomology.

23 pages. Final version, to appear in the Osaka Journal of Mathematics

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