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We construct projective asymptotically good moduli spaces parametrizing boundary polarized CY surface pairs, which are projective slc Calabi-Yau pairs $(X,D)$ such that $D$ is ample and $X$ has dimension two. The moduli space provides a…

Algebraic Geometry · Mathematics 2024-07-02 Harold Blum , Yuchen Liu

We study certain moduli spaces of sheaves on Enriques surfaces thereby obtaining, in every odd dimension, new examples of Calabi-Yau manifolds. We describe the geometry (canonical bundle, fundamental group, second Betti number and certain…

Algebraic Geometry · Mathematics 2019-05-09 Giulia Saccà

We show that the moduli space of parabolic bundles on the projective line and the polygon space are isomorphic, both as complex manifolds and symplectic manifolds equipped with structures of completely integrable systems, if the stability…

Symplectic Geometry · Mathematics 2019-08-15 Yuichi Nohara , Kazushi Ueda

This informal note provides some elementary examples to motivate the local structural results of [1] on the moduli space of genus one stable maps to projective space. The hope is that these examples will be helpful for graduate students to…

Algebraic Geometry · Mathematics 2011-06-16 Yi Hu

This note is but a research announcement, summarizing and explaining results proven and detailed in forthcoming papers. When one studies families of objects over curves, and the objects are parametrized by a Deligne-Mumford stack M, then…

Algebraic Geometry · Mathematics 2007-05-23 Dan Abramovich , Angelo Vistoli

We show that the moduli space of marked branched projective structures of genus g and branching degree n is a complex analytic space. In the case g > 1 we show that this moduli space is of dimension 6 g - 6 + n and we characterize its…

Algebraic Geometry · Mathematics 2023-11-17 Gustave Billon

Real projective structures on $n$-orbifolds are useful in understanding the space of representations of discrete groups into $\mathrm{SL}(n+1, \mathbb{R})$ or $\mathrm{PGL}(n+1, \mathbb{R})$. A recent work shows that many hyperbolic…

Geometric Topology · Mathematics 2015-07-03 Suhyoung Choi

We prove that the image of the lifted period map on the universal cover lies in a complex Euclidean space. We also prove that the Teichm\"uller spaces of a class of polarized manifolds have complex affine structures.

Algebraic Geometry · Mathematics 2026-02-19 Kefeng Liu , Yang Shen

We construct and study the moduli of hypersurfaces in toric orbifolds. Let $X$ be a projective toric orbifold and $\alpha \in Cl(X)$ an ample class. The moduli space is constructed as a quotient of the linear system $|\alpha|$ by $G =…

Algebraic Geometry · Mathematics 2024-05-22 Dominic Bunnett

We show that every coarse moduli space, parametrizing complex special linear rank two local systems with fixed boundary traces on a surface with nonempty boundary, is log Calabi-Yau in that it has a normal projective compactification with…

Algebraic Geometry · Mathematics 2020-10-07 Junho Peter Whang

We consider smooth, complex quasi-projective varieties $U$ which admit a compactification with a boundary which is an arrangement of smooth algebraic hypersurfaces. If the hypersurfaces intersect locally like hyperplanes, and the relative…

Algebraic Topology · Mathematics 2018-06-05 Graham C. Denham , Alexander I. Suciu

The twistor space of the moduli space of solutions of Hitchin's self-duality equations can be identified with the Deligne-Hitchin moduli space of $\lambda$-connections. We use real projective structures on Riemann surfaces to prove the…

Differential Geometry · Mathematics 2022-03-03 Sebastian Heller

Projective structures on compact real manifolds are classical objects in real differential geometry. Complex manifolds with a holomorphic projective structure on the other hand form a special class as soon as the dimension is greater than…

Algebraic Geometry · Mathematics 2015-03-02 Priska Jahnke , Ivo Radloff

Let M^3 be a compact, oriented, irreducible, and boundary incompressible 3-manifold. Assume that its fundamental group is without rank two abelian subgroups and its boundary is non-empty. We will show that every homomorphism from pi_1(M) to…

Geometric Topology · Mathematics 2007-05-23 Albert Marden

We construct proper good moduli spaces for moduli stacks of Bridgeland semistable orthosymplectic complexes on a complex smooth projective variety, which we propose as a candidate for compactifying moduli spaces of principal bundles for the…

Algebraic Geometry · Mathematics 2026-01-15 Chenjing Bu

In this paper we showed that every connected extremal K\"ahler submanifold of a complex projetive space has a natural extension which is a complete K\"ahler manifold and admits a holomorphic isometric immersion into the same ambient space.…

Differential Geometry · Mathematics 2023-06-29 Chao Li

We study projective structures on a surface having poles of prescribed orders. We obtain a monodromy map from a complex manifold parameterising such structures to the stack of framed $\mathrm{PGL}_2(\mathbb{C})$ local systems on the…

Geometric Topology · Mathematics 2020-07-14 Dylan G. L. Allegretti , Tom Bridgeland

In this paper, we introduce a new class of structured spaces which is locally modeled by Costello's L-infinity spaces. This provides an alternative approach to study the derived geometric structures in the algebraic, analytic, or smooth…

Algebraic Geometry · Mathematics 2014-11-20 Junwu Tu

In this article, the projectivity of finitely generated flat modules of a commutative ring are studied from a topological point of view. Then various interesting results are obtained. For instance, it is shown that if a ring has either a…

Commutative Algebra · Mathematics 2019-01-23 Abolfazl Tarizadeh

We give examples of generalized complex four-manifolds whose moduli space has infinitely many components.

Differential Geometry · Mathematics 2013-10-28 Gil R. Cavalcanti