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Anna Gąsior

Publications and source records attributed to Anna Gąsior.

10 recordsLinked to original sources
arXiv2023

Complex Vasquez invariant

In 1970 Vasquez proved that to every finite group $G$ we can assign a natural number $n(G)$ with the property that every flat manifold with holonomy $G$ is a total space of a fiber bundle, with the fiber being a flat torus and the base space -- a flat manifold of dimension less than or equal to $n(G)$. In particular, this means that the characteristic algebra of any flat manifold with holonomy $G$ vanishes in dimension greater than $n(G)$. We define a complex analog of Vasquez invariant, in which finite groups are considered as holonomy groups of compact flat Kähler manifolds.

math.AT↗
arXiv2022

Spin-structures on real Bott manifolds with Kähler structure

Let $M$ be a real Bott manifold with Kähler structure. Using Ishida characterization \cite{I11} we give necessary and sufficient condition for the existence of the spin-structure on $M$. In proof we use the technic developed in \cite{PS16} and characteristic classes.

math.DG↗
arXiv2018

Note about Stiefel-Whitney classes on real Bott manifolds

Real Bott manifolds is a class of flat manifolds with holonomy group $\mathbb Z_2^k$ of diagonal type. In this paper we want to show how we can compute even Stiefel - Whitney classes on real Bott manifolds. This paper is an answer to the question of professor Masuda if is it possible to extend A. Gąsior "Spin-structures on real Bott manifolds" (J. Korean Math. Soc. {\bf 54}, (2017), no. 2, 507 - 516) and compute any Stiefel-Whitney classes for real Bott manifolds. It also extends results of A. Gąsior, A. Szczepański "Flat manifolds with holonomy group $Z_2^k$ of diagonal type" (Osaka J. Math. {\bf 51} (2014), 1015 - 1025).

math.GT↗
arXiv2017

A short note about diffuse Bieberbach groups

We consider low dimensional diffuse Bieberbach groups. In particular we classify diffuse Bieberbach groups up to dimension 6. We also answer a question from [S. Kionke, J. Raimbault, On geometric aspects of diffuse groups, Doc. Math. 21 (2016), page 887] about minimal dimension of a non-diffuse Bieberbach group which does not contain three-dimensional Hantzsche-Wendt group.

math.GR↗
arXiv2017

Spin-structures on real Bott manifolds with Kähler structures

Let M be a real Bott manifold with Kähler structure. Using Ishida characterization we give necessary and sufficient condition for the existence of the Spin-structure on M. In proof we use the technic developed in Popko, Szczepański "Cohomological rigity of oriented Hantzsche-Wendt manifolds" (Adv. Math. 302 (2016), 1044 - 1068) and characteristic classes.

math.DG↗
arXiv2013

Spin structures on almost-flat manifolds

We give a necessary and suffcient condition for almost-flat manifolds with cyclic holonomy to admit a Spin structure. Using this condition we find all 4-dimensional orientable almost- flat manifolds with cyclic holonomy that do not admit a Spin structure.

math.GT↗
arXiv2013

Tangent bundles of Hantzsche-Wendt manifolds

We formulate a condition for an existence of a $Spin^C$ - structure on an oriented at manifold $M^n$ with $H^2(Mn;R) = 0$. As an application we shall prove that all cyclic Hantzsche - Wendt manifolds have not the $Spin^C$-structure.

math.AT↗
arXiv2012

Flat manifolds with holonomy group Z_2^k of diagonal type

We consider relations between two families of flat manifolds with holonomy group (Z_2)^k of diagonal type. The family ${\cal RBM}$ of real Bott manifolds and the family ${\cal GHW}$ of generalized Hantzsche-Wendt manifolds. In particular, we prove that the intersection ${\cal GHW}\cap {\cal RBM}$ is not empty. We also consider some class of real Bott manifolds without $\operatorname{Spin}$ and $\operatorname{Spin}^{\C}$ structure. There are given conditions for the (non)existence of such structures.

math.AT↗