Integral cohomology rings of weighted Grassmann orbifolds and rigidity properties (2307.01153v2)

Abstract: In this paper, we introduce Pl\"{u}cker weight vector' and establish the definition of a weighted Grassmann orbifold $\mbox{Gr}_{\mathbf{b}}(k,n)$, corresponding to a Pl\"{u}cker weight vector$\mathbf{b}$'. We achieve an explicit classification of weighted Grassmann orbifolds up to certain homeomorphism in terms of the Pl\"{u}cker weight vectors. We study the integral cohomology of $\mbox{Gr}{\bf b}(k,n)$ and provide some sufficient conditions such that the integral cohomology of $\mbox{Gr}{\bf b}(k,n)$ has no torsion. We describe the integral equivariant cohomology ring of divisive weighted Grassmann orbifolds and compute all the equivariant structure constants with integer coefficients. Eminently, we compute the integral cohomology rings of divisive weighted Grassmann orbifolds explicitly.