On the rank of the double cohomology of moment-angle complexes

Abstract

In [6], the authors construct a cochain complex $C\!H^*(\mathcal{Z}_{\mathcal{K}})$ on the cohomology of a moment-angle complex $\mathcal{Z}_{\mathcal{K}}$ and call the resulting cohomology the double cohomology, $H\!H^*(\mathcal{Z}_{\mathcal{K}})$. In this paper, we study the change of rank in double cohomology after gluing an $n$-simplex to a simplicial complex $\mathcal{K}$ in certain conditions. As an application, we give a positive answer to an open problem in [6]: For any even integer $r$, there always exists a simlicial complex $\mathcal{K}$ such that $\operatorname{rank} H\!H^*(\mathcal{Z}_{\mathcal{K}})=r$.