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arXiv 1809.02307math.AT
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有限群在Dold流形乘积上的自由作用

Free actions of finite groups on products of Dold manifolds

Pinka Dey

摘要:

Dold流形$ P(m,n)$是$S^m \times \mathbb{C}P^n$通过对极作用于$ S^m $的自由对合和通过复共轭作用于$ \mathbb{C}P^n $的商。本文研究了有限群在Dold流形乘积上的自由作用。证明了如果有限群$ G $在等价于${\displaystyle \prod_{i=1}^{k} P(2m_i,n_i)}$的有限维CW-复同伦上自由模2上同调作用,则对某些$l\leq k$,有$G\cong (\mathbb{Z}_2)^l$.这通过首先证明$ \displaystyle \prod_{i=1}^{k} S^{2m_i} \times \mathbb{C} P^{n_i} $的类似断言来实现。我们还确定了Dold流形上任意自由对合轨道空间的可能模2上同调代数,并给出了它在$ \mathbb{Z}_2 $ -等变映射中的应用.

英文摘要:

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.

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