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Yuki Minowa

Publications and source records attributed to Yuki Minowa.

7 recordsLinked to original sources
arXiv2026

Topological complexity sequences of groups

We define the topological complexity sequence of a group as the sequence of topological complexities of its Milnor constructions. This sequence may be regarded as an intrinsic refinement of the topological complexity of a group and, unlike topological complexity itself, is meaningful for groups of infinite cohomological dimension. We show that the topological complexity sequence of every group of infinite cohomological dimension is weakly increasing and unbounded. We then estimate its growth and determine its asymptotic behavior for a finite group of even order.

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arXiv2026

On the topological complexity of non-simply connected spaces

Topological complexity is a numerical homotopy invariant that measures the instability of motion planning in a space. To study the topological complexity of non-simply connected spaces, Costa and Farber introduced a cohomology class whose nilpotency gives a lower bound of topological complexity. Farber and Mescher constructed a spectral sequence that evaluates this nilpotency without direct computation. We extend these results with respect to a group homomorphism. As an application, we determine the topological complexity of some 3-manifolds with nonabelian fundamental group.

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arXiv2025

Rational sequential parametrized topological complexity

Sequential parametrized topological complexity is a numerical homotopy invariant of a fibration, which arose in the robot motion planning problem with external constraints. In this paper, we study sequential parametrized topological complexity in view of rational homotopy theory. We generalize results on topological complexity, and in particular, give an explicit algebraic upper bound for sequential parametrized topological complexity when a fibration admits a certain decomposition, which is a generalization of the result of Hamoun, Rami and Vandembroucq on topological complexity.

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arXiv2024

Parametrized topological complexity of spherical fibrations over spheres

Parametrized topological complexity is a homotopy invariant that represents the degree of instability of motion planning problem that involves external constraints. We consider the parametrized topological complexity in the case of spherical fibrations over spheres. We explicitly compute a lower bound in terms of weak category and determine the parametrized topological complexity of some spherical fibrations.

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arXiv2023

Homotopy commutativity in symmetric spaces

We extend the former results of Ganea and the two of the authors with Takeda on the homotopy commutativity of the loop spaces of Hermitian symmetric spaces such that the loop spaces of all irreducible symmetric spaces but $\mathbb{C}P^3$ are not homotopy commutative.

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arXiv2023

On the cohomology of the classifying spaces of $SO(n)$-gauge groups over $S^2$

Let $\mathcal{G}_α(X, G)$ be the $G$-gauge group over a space $X$ corresponding to a map $α\colon X \to BG$. We compute the integral cohomology of $B\mathcal{G}_{1}(S^2, SO(n))$ for $n = 3,4$. We also show that the homology of $B\mathcal{G}_{1}(S^2, SO(n))$ is torsion free if and only if $n\le 4$. As an application, we classify the homotopy types of $SO(n)$-gauge groups over a Riemann surface for $n\le 4$.

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