English

A generalization of moment-angle manifolds with non-contractible orbit spaces

Algebraic Topology 2024-03-27 v7 Geometric Topology

Abstract

We generalize the notion of moment-angle manifold over a simple convex polytope to an arbitrary nice manifold with corners. For a nice manifold with corners Q, we first compute the stable decomposition of the moment-angle manifold Z_Q via a construction called rim-cubicalization of Q. From this, we derive a formula to compute the integral cohomology group of Z_Q via the strata of Q. This generalizes the Hochster's formula for the moment-angle manifold over a simple convex polytope. Moreover, we obtain a description of the integral cohomology ring of Z_Q using the idea of partial diagonal maps. In addition, we define the notion of polyhedral product of a sequence of based CW-complexes over Q and obtain similar results for these spaces as we do for Z_Q. Using this general construction, we can compute the equivariant cohomology ring of Z_Q with respect to its canonical torus action from the Davis-Januszkiewicz space of Q. The result leads to the definition of a new notion called the topological face ring of Q, which generalizes the notion of face ring of a simple polytope. Meanwhile, we obtain some parallel results for the real moment-angle manifold RZ_Q over Q.

Keywords

Cite

@article{arxiv.2011.10366,
  title  = {A generalization of moment-angle manifolds with non-contractible orbit spaces},
  author = {Li Yu},
  journal= {arXiv preprint arXiv:2011.10366},
  year   = {2024}
}

Comments

46 pages, 2 figures. A new reference is added and some typos are fixed. Final version before publication