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Equiangular tight frames are examples of Grassmannian line packings for a Hilbert space. More specifically, according to a bound by Welch, they are minimizers for the maximal magnitude occurring among the inner products of all pairs of…

Functional Analysis · Mathematics 2015-09-18 Bernhard G. Bodmann , John Haas

We explore to what extent one may hope to preserve geometric properties of three dimensional manifolds with lower scalar curvature bounds under Gromov-Hausdorff and Intrinsic Flat limits. We introduce a new construction, called sewing, of…

Differential Geometry · Mathematics 2022-01-14 J. Basilio , J. Dodziuk , C. Sormani

This is the third of a series of papers studying real algebraic threefolds, but the methods are mostly independent from the previous two. Let $f:X\to S$ be a map of a smooth projective real algebraic 3-fold to a surface $S$ whose general…

Algebraic Geometry · Mathematics 2007-05-23 János Kollár

We study topological properties of random closed curves on an orientable surface $S$ of negative Euler characteristic. Letting $\gamma_{n}$ denote the conjugacy class of the $n^{th}$ step of a simple random walk on the Cayley graph driven…

Geometric Topology · Mathematics 2022-11-17 Tarik Aougab , Jonah Gaster

We consider a connected negative definite plumbing graph, and we assume that the associated plumbed 3-manifold is a rational homology sphere. We provide two new combinatorial formulae for the Seiberg-Witten invariant of this manifold. The…

Algebraic Geometry · Mathematics 2010-10-07 András Némethi

For any negative definite plumbed 3-manifold M we construct from its plumbed graph a graded Z[U]-module. This, for rational homology spheres, conjecturally equals the Heegaard-Floer homology of Ozsvath and Szabo, but it has even more…

Algebraic Geometry · Mathematics 2007-09-07 Andras Nemethi

We develop a theory of link projections to trivalent spines of 3-manifolds. We prove a Reidemeister Theorem providing a set of combinatorial moves sufficient to relate the projections of isotopic links. We also show that any link admits a…

Geometric Topology · Mathematics 2024-05-13 Jack Brand , Benjamin A. Burton , Zsuzsanna Dancso , Alexander He , Adele Jackson , Joan Licata

We show how the theory of tangles is equivalent to that of well-connected tangles. These are drawn on a surface with boundary, and equivalent via Reidemeister moves of a restricted kind. This reworking of the graphical foundations for link…

Geometric Topology · Mathematics 2013-02-19 Peter M. Johnson , Sóstenes Lins

We study the sutured Floer homology invariants of the sutured manifold obtained by cutting a knot complement along a Seifert surface, R. We show that these invariants are finer than the "top term" of the knot Floer homology, which they…

Geometric Topology · Mathematics 2014-10-01 Matthew Hedden , Andras Juhasz , Sucharit Sarkar

We generalize Turaev's definition of torsion invariants of pairs (M,x), where M is a 3-dimensional manifold and x is an Euler structure on M (a non-singular vector field up to homotopy relative to bM and local modifications in int(M).…

Geometric Topology · Mathematics 2007-05-23 Riccardo Benedetti , Carlo Petronio

We study the large $r$ asymptotic behavior of the Turaev-Viro invariants $TV_r(M; e^{\frac{2\pi i}{r}})$ of 3-manifolds with toroidal boundary, under the operation of gluing a Seifert-fibered 3-manifold along a component of $\partial M$. We…

Geometric Topology · Mathematics 2025-05-06 Renaud Detcherry , Efstratia Kalfagianni , Shashini Marasinghe

When the Seiberg-Witten curve of a four-dimensional $\mathcal{N}=2$ supersymmetric gauge theory wraps a Riemann surface as a multi-sheeted cover, a topological constraint requires that in general the curve should develop ramification…

High Energy Physics - Theory · Physics 2015-03-18 Chan Y. Park

We use rudiments of the Seiberg-Witten gluing theory for trivial circle bundles over a Riemann surface to relate de Seiberg-Witten basic classes of two $4$-manifolds containing Riemann surfaces of the same genus and self-intersection zero…

dg-ga · Mathematics 2008-02-03 Vicente Muñoz

In this paper, we investigate the Seiberg-Witten gauge theory for Seifert fibered spaces. The monopoles over these three-manifolds, for a particular choice of metric and perturbation, are completely described. Gradient flow lines between…

Geometric Topology · Mathematics 2009-09-25 Tomasz S. Mrowka , Peter S. Ozsváth , Baozhen Yu

We adopt a measure-theoretic perspective on the Riemannian approximation scheme proving a sub-Riemannian Gauss-Bonnet theorem for surfaces in 3D contact manifolds. We show that the zero-order term in the limit is a singular measure…

Differential Geometry · Mathematics 2025-10-01 Davide Barilari , Eugenio Bellini , Andrea Pinamonti

We show that every co--orientable taut foliation F of an orientable, atoroidal 3-manifold admits a transverse essential lamination. If this transverse lamination is a foliation G, the pair F,G are the unstable and stable foliation…

Geometric Topology · Mathematics 2015-06-26 Danny Calegari

This paper initiates a systematic study of the relation of commensurability of surface automorphisms, or equivalently, fibered commensurability of 3-manifolds fibering over the circle. We show that every hyperbolic fibered commensurability…

Geometric Topology · Mathematics 2011-04-04 Danny Calegari , Hongbin Sun , Shicheng Wang

In this article we show that all cyclic branched covers of a Seifert link have left-orderable fundamental groups, and therefore admit co-oriented taut foliations and are not $L$-spaces, if and only if it is not an $ADE$ link up to…

Geometric Topology · Mathematics 2024-02-27 Steven Boyer , Cameron McA. Gordon , Ying Hu

We define a torsion invariant T for every balanced sutured manifold (M,g), and show that it agrees with the Euler characteristic of sutured Floer homology SFH. The invariant T is easily computed using Fox calculus. With the help of T, we…

Geometric Topology · Mathematics 2012-07-11 Stefan Friedl , András Juhász , Jacob Rasmussen

We show that any two same-genus, oriented, boundary parallel surfaces bounded by a non-split, alternating link into the 4-ball are smoothly isotopic fixing boundary. In other words, any same-genus Seifert surfaces for a non-split,…

Geometric Topology · Mathematics 2026-01-14 Seungwon Kim , Maggie Miller , Jaehoon Yoo