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In this paper, we study the topology of ordered Hurwitz space. These are moduli spaces of branched covers with a choice of ordering on the branched points. Answering a question of Ellenberg, we prove that the homology of ordered Hurwitz…

Algebraic Topology · Mathematics 2025-09-09 Zachary Himes , Jeremy Miller , Jennifer C. H. Wilson

In this paper we study homological stability for spaces ${\rm Hom}(\mathbb{Z}^n,G)$ of pairwise commuting $n$-tuples in a Lie group $G$. We prove that for each $n\geqslant 1$, these spaces satisfy rational homological stability as $G$…

Algebraic Topology · Mathematics 2021-03-16 Daniel A. Ramras , Mentor Stafa

We prove that the homology of the mapping class groups of non-orientable surfaces stabilizes with the genus of the surface. Combining our result with recent work of Madsen and Weiss, we obtain that the classifying space of the stable…

Geometric Topology · Mathematics 2009-11-11 Nathalie Wahl

Homological stability has shown itself to be a powerful tool for the computation of homology of families of groups such as general linear groups, mapping class groups or automorphisms of free groups. We survey here tools and techniques for…

Algebraic Topology · Mathematics 2025-01-06 Nathalie Wahl

In [Pal13] (arXiv:1106.4540) the second author proved that the sequence of "oriented" configuration spaces on an open connected manifold exhibits homological stability as the number of particles goes to infinity. To complement that result…

Algebraic Topology · Mathematics 2018-05-22 Jeremy Miller , Martin Palmer

By proving that several new complexes of embedded disks are highly connected, we obtain several new homological stability results. Our main result is homological stability for topological chiral homology on an open manifold with…

Algebraic Topology · Mathematics 2016-02-08 Alexander Kupers , Jeremy Miller

In Appendix A of his article on rational functions, Segal proved homological stability for configuration spaces with a stability slope of 1/2. This was later improved to a slope of 1 by Church and Randal-Williams if one works with rational…

Algebraic Topology · Mathematics 2019-05-28 Alexander Kupers , Jeremy Miller

We prove homological stability for two different flavours of asymptotic monopole moduli spaces, namely moduli spaces of framed Dirac monopoles and moduli spaces of ideal monopoles. The former are Gibbons-Manton torus bundles over…

Algebraic Topology · Mathematics 2023-10-19 Martin Palmer , Ulrike Tillmann

Wahl recently proved that the homology of the non-orientable mapping class group stabilizes as the genus increases. In this short note we analyse the situation where the underlying non-orientable surfaces have marked points.

Algebraic Topology · Mathematics 2008-06-09 Elizabeth Hanbury

Let M be an open, connected manifold. A classical theorem of McDuff and Segal states that the sequence of configuration spaces of n unordered, distinct points in M is homologically stable with coefficients in Z: in each degree, the integral…

Algebraic Topology · Mathematics 2018-05-22 Martin Palmer

We prove Conjecture F from [VW12] which states that the complements of closures of certain strata of the symmetric power of a smooth irreducible complex variety exhibit rational homological stability. Moreover, we generalize this conjecture…

Algebraic Topology · Mathematics 2013-12-24 Alexander Kupers , Jeremy Miller

We prove a new kind of homological stability theorem for automorphism groups of finitely-generated projective modules over Dedekind domains, which takes into account all possible stabilisation maps between these, rather than only…

Commutative Algebra · Mathematics 2024-05-14 Oscar Randal-Williams

We discuss how stability is related to the D-topology of mapping spaces, equipped with the functional diffeology. Indeed, we show that stable classes of mapping spaces are D-open. After a reformulation of the classical stability theorem of…

Differential Geometry · Mathematics 2023-05-30 Alireza Ahmadi

Given a manifold with boundary, one can consider the space of subsurfaces of this manifold meeting the boundary in a prescribed fashion. It is known that these spaces of subsurfaces satisfy homological stability if the manifold has at least…

Algebraic Topology · Mathematics 2020-09-02 Thorben Kastenholz

Following the argument for diffeomorphisms by Galatius and Randal-Williams, we prove that homeomorphisms of 1-connected manifolds of even dimension at least 6 exhibit homological stability. We deduce similar results for PL homeomorphisms…

Algebraic Topology · Mathematics 2016-08-23 Alexander Kupers

In this paper we present a new proof of the homological stability of the moduli space of closed surfaces in a simply connected background space $K$, which we denote by $S_g (K)$. The homology stability of surfaces in $K$ with an arbitrary…

Algebraic Topology · Mathematics 2010-02-15 Ralph L. Cohen , Ib Madsen

We prove a homological stabilization theorem for Hurwitz spaces: moduli spaces of branched covers of the complex projective line. This has the following arithmetic consequence: let l>2 be prime and A a finite abelian l-group. Then there…

Number Theory · Mathematics 2015-12-03 Jordan S. Ellenberg , Akshay Venkatesh , Craig Westerland

In a previous paper, arXiv:1301.4409, we showed that the moduli space of curves C with a G-symmetry (that is, with a faithful action of a finite group G), having a fixed generalized homological invariant, is irreducible if the genus g' of…

Algebraic Geometry · Mathematics 2026-01-28 Fabrizio Catanese , Michael Loenne , Fabio Perroni

We prove twisted homological stability for handlebody mapping class groups. Using the categorical framework developed by Randal-Williams and Wahl, we establish that the homology of the handlebody groups stabilises with respect to both genus…

Geometric Topology · Mathematics 2026-03-04 Erik Lindell , Arthur Soulié

We prove that in a stable range, the rational cohomology of the moduli space of curves with level structures is the same as that of the ordinary moduli space of curves.

Algebraic Geometry · Mathematics 2025-06-25 Andrew Putman