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Free actions of finite groups on products of Dold manifolds

By Pinka Dey


The Dold manifold $ P(m,n)$ is the quotient of $S^m \times \mathbb{C}P^n$ by the free involution that acts antipodally on $ S^m $ and by complex conjugation on $ \mathbb{C}P^n $. In this paper, we investigate free actions of finite groups on products of Dold manifolds. We show that if a finite group $ G $ acts freely and mod 2 cohomologically trivially on a finite-dimensional CW-complex homotopy equivalent to ${\displaystyle \prod_{i=1}^{k} P(2m_i,n_i)}$, then $G\cong (\mathbb{Z}_2)^l$ for some $l\leq k$. This is achieved by first proving a similar assertion for $ \displaystyle \prod_{i=1}^{k} S^{2m_i} \times \mathbb{C} P^{n_i} $. We also determine the possible mod 2 cohomology algebra of orbit spaces of arbitrary free involutions on Dold manifolds, and give an application to $ \mathbb{Z}_2 $-equivariant maps.Comment: 17 pages, Theorems 1.3 and 1.4 have been improved, introduction modifie

Topics: Mathematics - Algebraic Topology, 57S25 (Primary) 57S17, 55T10 (Secondary)
Year: 2019
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