LS-category and topological complexity of real torus manifolds and Dold manifolds of real torus type (2401.06680v1)

Abstract: The real torus manifolds are a generalization of small covers and generalized real Bott manifolds. We compute the LS-category of these manifolds under some constraints and obtain sharp bounds on their topological complexities. We obtain a simplified description of their cohomology ring and discuss a relation on the cup-product of its generators. We obtain the sharp bounds on their zero-divisors-cup-lengths. We improve the dimensional upper bound on their topological complexity. We also show that under certain hypotheses, the topological complexity of real torus manifolds of dimension $n$ is either $2n$ or $2n+1$. We compute the $\mathbb{Z}_2$-equivariant LS-category of any small cover when the $\mathbb{Z}_2$-fixed points are path connected. We then compute the LS-category of Dold manifolds of real torus type and obtain sharp bounds on their topological complexity. In the end, we obtain sharp bounds on the symmetric topological complexity of a class of these manifolds.