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Let $A$ be a non-isotrivial almost ordinary abelian surface with possibly bad reductions over a global function field of odd characteristic $p$. Suppose $\Delta$ is an infinite set of positive integers, such that…

Number Theory · Mathematics 2025-04-10 Ruofan Jiang

ASD (Abstract Stone Duality) is a re-axiomatisation of general topology in which the topology on a space is treated, not as an infinitary lattice, but as an exponential object of the same category as the original space, with an associated…

General Topology · Mathematics 2019-03-14 Paul Taylor

We study complex solvmanifolds $\Gamma\backslash G$ with holomorphically trivial canonical bundle. We show that the trivializing section of this bundle can be either invariant or non-invariant by the action of $G$. First we characterize the…

Differential Geometry · Mathematics 2024-07-11 Adrián Andrada , Alejandro Tolcachier

Using the L^2 norm of the Higgs field as a Morse function, we study the moduli spaces of U(p,q)-Higgs bundles over a Riemann surface. We require that the genus of the surface be at least two, but place no constraints on (p,q). A key step is…

Algebraic Geometry · Mathematics 2022-11-15 Steven B. Bradlow , Oscar Garcia-Prada , Peter B. Gothen

Given a compact symplectic manifold $(M,\omega)$ and a compact Lagrangian submanifold $L\subset(M,\omega)$, we describe small deformations of the pair $(\omega,L)$ modulo the action by isotopies. We show that the resulting moduli space can…

Symplectic Geometry · Mathematics 2025-12-25 Stephane Geudens , Florian Schaetz , Alfonso G. Tortorella

If a Legendrian knot $\Lambda$ in the standard contact 3-sphere bounds an orientable exact Lagrangian surface $\Sigma$ in the standard symplectic 4-ball, then the genus of $\Sigma$ is equal to the slice genus of (the smooth knot underlying)…

Symplectic Geometry · Mathematics 2018-03-16 Tolga Etgü

Let $LG$ be the loop group of a compact, connected Lie group $G$. We show that the tangent bundle of any proper Hamiltonian $LG$-space $\mathcal{M}$ has a natural completion $\overline{T}\mathcal{M}$ to a strongly symplectic…

Symplectic Geometry · Mathematics 2017-06-26 Yiannis Loizides , Eckhard Meinrenken , Yanli Song

We introduce constructions of exact Lagrangian cobordisms with cylindrical Legendrian ends and study their invariants which arise from Symplectic Field Theory. A pair $(X,L)$ consisting of an exact symplectic manifold $X$ and an exact…

Symplectic Geometry · Mathematics 2012-12-27 Tobias Ekholm , Ko Honda , Tamás Kálmán

A real Lie algebra is said to be characteristically solvable if its derivation algebra is solvable. We explicitly determine the moduli space of left-invariant metrics, up to isometric automorphism, for $6$-dimensional nilmanifolds whose…

Differential Geometry · Mathematics 2025-03-07 Isolda Cardoso , Ana Cosgaya , Silvio Reggiani

Let $\mathfrak{M}(\Sigma)$ be an open and connected subset of the space of hyperbolic metrics on a closed orientable surface, and $\mathfrak{M}(M)$ an open and connected subset of the space of metrics on an orientable manifold of dimension…

Differential Geometry · Mathematics 2023-03-24 Nathaniel Sagman

Let $M$ be a simply connected pseudo-Riemannian homogeneous space of finite volume with isometry group $G$. We show that $M$ is compact and that the solvable radical of $G$ is abelian and the Levi factor is a compact semisimple Lie group…

Differential Geometry · Mathematics 2019-12-11 Oliver Baues , Wolfgang Globke , Abdelghani Zeghib

For a symplectic manifold with an anti-symplectic involution having non-empty fixed locus, we construct a model of the moduli space of real sphere maps out of moduli spaces of decorated disk maps and give an explicit expression for its…

Symplectic Geometry · Mathematics 2015-10-29 Penka Georgieva

Let $M$ be a compact Riemannian manifold, and let $G$ be a compact simple Lie group with bi-invariant metric that is not $\operatorname{Sp}(n)$ for $n \geq 8$, $E_{8}$, $F_{4}$, or $G_{2}$. We show that the singular set of any stable…

Differential Geometry · Mathematics 2026-05-06 Jacob Krantz

Let R be a compact, connected, orientable surface of genus g with p boundary components. Let C(R) be the complex of curves on R and Mod_R^* be the extended mapping class group of R. Suppose that either g = 2 and p > 1 or g > 2 and p >= 0.…

Geometric Topology · Mathematics 2007-05-23 Elmas Irmak

Let M be a compact symplectic manifold, and L be a closed Lagrangian submanifold which can be lifted to a Legendrian submanifold in the contactization of M. For any Legendrian deformation of L satisfying some given conditions, we get a new…

Symplectic Geometry · Mathematics 2007-05-23 Hai-Long Her

We give a topological description of the space of quadratic rational maps with superattractive two-cycles: its "non-escape locus" M2 (the analog of the Mandelbrot set M) is locally connected, it is the continuous image of M under a…

Dynamical Systems · Mathematics 2011-12-21 Dzmitry Dudko

We classify Lie 3-algebras possessing an invariant lorentzian inner product. The indecomposable objects are in one-to-one correspondence with compact real forms of metric semisimple Lie algebras. We analyse the moduli space of classical…

High Energy Physics - Theory · Physics 2014-11-18 Paul de Medeiros , José Figueroa-O'Farrill , Elena Méndez-Escobar

A Hilbert space operator $U$ is called universal (in the sense of Rota) if every Hilbert space operator is similar to a multiple of $U$ restricted to one of its invariant subspaces. It follows that the Invariant Subspace Problem for Hilbert…

Functional Analysis · Mathematics 2021-01-22 João R. Carmo , S. Waleed Noor

Special Lagrangian submanifolds are submanifolds of a Calabi-Yau manifold calibrated by the real part of the holomorphic volume form. In this paper we use elliptic theory for edge-degenerate differential operators on singular manifolds to…

Differential Geometry · Mathematics 2017-03-21 Josue Rosario-Ortega

It is well known that the normaized characters of integrable highest weight modules of given level over an affine Lie algebra $\hat{\frak{g}}$ span an $SL_2(\mathbf{Z})$-invariant space. This result extends to admissible…

Representation Theory · Mathematics 2017-01-13 Victor G. Kac , Minoru Wakimoto
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