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Trudy Matematicheskogo Instituta imeni V.A. Steklova, 2024, Volume 326, Pages 193–239
DOI: https://doi.org/10.4213/tm4432
(Mi tm4432)
 

Manifolds realized as orbit spaces of non-free $\mathbb Z_2^k$-actions on real moment-angle manifolds

N. Yu. Erokhovetsab

a Lomonosov Moscow State University, Faculty of Mechanics and Mathematics
b Steklov Mathematical Institute of Russian Academy of Sciences, Moscow
Abstract: We consider (non-necessarily free) actions of subgroups $H\subset \mathbb Z_2^m$ on the real moment-angle manifold $\mathbb R\mathcal{Z}_P$ corresponding to a simple convex $n$ polytope $P$ with $m$ facets. The criterion when the orbit space $\mathbb R\mathcal{Z}_P/H$ is a topological manifold (perhaps with a boundary) can be extracted from results by M.A. Mikhailova and C. Lange. For any dimension $n$ we construct series of manifolds $\mathbb R\mathcal{Z}_P/H$ homeomorphic to $S^n$ and series of manifolds $M^n=\mathbb R\mathcal{Z}_P/H$ admitting a hyperelliptic involution $\tau\in\mathbb Z_2^m/H$, that is an involution $\tau$ such that $M^n/\langle\tau\rangle$ is homeomorphic to $S^n$. For any simple $3$-polytope $P$ we classify all subgroups $H\subset\mathbb Z_2^m$ such that $\mathbb R\mathcal{Z}_P/H$ is homeomorphic to $S^3$. For any simple $3$-polytope $P$ and any subgroup $H\subset\mathbb Z_2^m$ we classify all hyperelliptic involutions $\tau\in\mathbb Z_2^m/H$ acting on $\mathbb R\mathcal{Z}_P/H$. As a corollary we obtain that a $3$-dimensional small cover has $3$ hyperelliptic involutions in $\mathbb Z_2^3$ if and only if it is a rational homology $3$-sphere and if and only if it corresponds to a triple of Hamiltonian cycles such that each edge of the polytope belongs to exactly two of them.
Keywords: non-free action of a finite group, convex polytope, real moment-angle manifold, hyperelliptic manifold, rational homology sphere, Hamiltonian cycle.
Funding agency Grant number
Russian Science Foundation 23-11-00143
This work was supported by the Russian Science Foundation under grant no. 23-11-00143, https://rscf.ru/en/project/23-11-00143/
Received: March 1, 2024
Revised: June 19, 2024
Accepted: June 29, 2024
Document Type: Article
UDC: 515.14+515.16+514.15+514.172.45
Language: Russian
Citation: N. Yu. Erokhovets, “Manifolds realized as orbit spaces of non-free $\mathbb Z_2^k$-actions on real moment-angle manifolds”, Topology, Geometry, Combinatorics, and Mathematical Physics, Collected papers. Dedicated to Victor Matveevich Buchstaber on the occasion of his 80th birthday, Trudy Mat. Inst. Steklova, 326, Steklov Math. Inst., Moscow, 2024, 193–239
Citation in format AMSBIB
\Bibitem{Ero24}
\by N.~Yu.~Erokhovets
\paper Manifolds realized as orbit spaces of non-free $\mathbb Z_2^k$-actions on real moment-angle manifolds
\inbook Topology, Geometry, Combinatorics, and Mathematical Physics
\bookinfo Collected papers. Dedicated to Victor Matveevich Buchstaber on the occasion of his 80th birthday
\serial Trudy Mat. Inst. Steklova
\yr 2024
\vol 326
\pages 193--239
\publ Steklov Math. Inst.
\publaddr Moscow
\mathnet{http://mi.mathnet.ru/tm4432}
\crossref{https://doi.org/10.4213/tm4432}
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    Труды Математического института имени В. А. Стеклова Proceedings of the Steklov Institute of Mathematics
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