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Projective spaces for finite-dimensional vector spaces over general fields are considered. The geometry of these spaces and the theory of line bundles over these spaces is presented. Particularly, the space of global regular sections of…

Algebraic Geometry · Mathematics 2023-09-21 Andrew D. Lewis

A famous conjecture attributed to Kodaira asks whether any compact Kaehler manifold can be approximated by projective manifolds. We confirm this conjecture on projectivized direct sums of three line bundles on three-dimensional complex tori…

Algebraic Geometry · Mathematics 2007-05-23 Jean-Pierre Demailly , Thomas Eckl , Thomas Peternell

We prove the effectiveness of the log Iitaka fibration in Kodaira codimension two for varieties of dimension$\le 4$. In particular, we finish the proof of effective log Iitaka fibration in dimension two. Also, we show that for the log…

Algebraic Geometry · Mathematics 2008-11-26 Gueorgui Todorov , Chenyang Xu

This paper lays the foundation for determining the Kodaira dimension of the projectivized strata of Abelian differentials with prescribed zero and pole orders in large genus. We work with the moduli space of multi-scale differentials…

Algebraic Geometry · Mathematics 2022-04-27 Dawei Chen , Matteo Costantini , Martin Möller

In this paper we investigate the Kodaira dimension of almost complex $4$-manifolds with torsion first Chern class. First, we prove that, if the almost complex structure is also tamed, the only possible values for the Kodaira dimension are…

Differential Geometry · Mathematics 2025-11-26 Lorenzo Sillari , Adriano Tomassini

Every finite collection of oriented closed geodesics in the modular surface has a canonically associated link in its unit tangent bundle coming from the periodic orbits of the geodesic flow. We study the volume of the associated link…

Geometric Topology · Mathematics 2024-12-13 Connie On Yu Hui , Dionne Ibarra , José Andrés Rodríguez Migueles

We obtain sharp volume bounds on the boundaries of Alexandrov spaces with given lower curvature bound, dimension, and radius. We also completely classify the rigidity case and analyze almost rigidity. Our results are new even for smooth…

Differential Geometry · Mathematics 2023-08-29 Qin Deng , Vitali Kapovitch

Given positive integers $d\geq\kappa$, and a subset $\Gamma\subset [0,1]$, let $\mathrm{Ivol}_{\mathrm{lc}}^{\Gamma}(d,\kappa)$ denote the set of Iitaka volumes of $d$-dimensional projective log canonical pairs $(X, B)$ such that the…

Algebraic Geometry · Mathematics 2024-07-11 Guodu Chen , Jingjun Han , Wenfei Liu

In this note we study properties of partially ample line bundles on simplicial projective toric varieties. We prove that the cone of q-ample line bundles is a union of rational polyhedral cones, and calculate these cones in examples. We…

Algebraic Geometry · Mathematics 2014-09-29 Nathan Broomhead , John Christian Ottem , Artie Prendergast-Smith

We treat the boundary problem for complex varieties with isolated singularities, of complex dimension greater than or equal to 3, non necessarily compact, which are contained in strongly convex, open subsets of a complex Hilbert space H. We…

Complex Variables · Mathematics 2013-07-31 Samuele Mongodi , Alberto Saracco

We use the ideas of symplectic quantization for quantizing fields in finite volumes. We consider, as examples, the Klein-Gordon and electromagnetic fields in three dif- ferent boxes. As a second idea we consider the given boundary…

High Energy Physics - Theory · Physics 2013-11-05 S. Chenarani , A. Shirzad

We consider rationally connected complex projective manifolds M and show that their loop spaces--infinite dimensional complex manifolds--have properties similar to those of M. Furthermore, we give a finite dimensional application concerning…

Algebraic Geometry · Mathematics 2007-05-23 L. Lempert , E. Szabo

We prove that any two-dimensional moduli space of stable 2-vector bundles, in the non-filtrable range, on a primary Kodaira surface is a primary Kodaira surface. If a universal bundle exists, then the two surfaces are homeomorphic up to…

Algebraic Geometry · Mathematics 2013-11-19 Marian Aprodu , Ruxandra Moraru , Matei Toma

In this paper, we prove effective upper bounds for effective sections of line bundles on projective varieties and hermitian line bundles on arithmetic varieties in terms of the volumes. They are effective versions of the Hilbert--Samuel…

Number Theory · Mathematics 2014-01-23 Xinyi Yuan , Tong Zhang

We treat the boundary problem for complex varieties (with isolated singularities) of dimension greater than one, which are contained in a suitable class of strictly pseudoconvex, unbounded domains of C^n.

Complex Variables · Mathematics 2007-05-23 Giuseppe Della Sala , Alberto Saracco

We extend some of the results obtained for subvarieties of the moduli stack of canonically polarized manifolds in "Base spaces of non-isotrivial families of smooth minimal models" (math.AG/0103122) to moduli of polarized minimal models of…

Algebraic Geometry · Mathematics 2007-05-23 Eckart Viehweg , Kang Zuo

This paper extends our earlier results to higher dimensions using a different approach, based on the rigidity of complex structures on certain domains.

Differential Geometry · Mathematics 2011-04-22 X-X. Chen , S. K. Donaldson

Here we study and classify polarized threefolds whose Kodaira energies are less than -1/2. The Kodaira energy of a polarized manifold (M, L), a pair consisting of a smooth complex algebraic variety M and an ample line bundle L on it, is…

alg-geom · Mathematics 2008-02-03 Takao Fujita

We give a relation between the existence of a Zariski decomposition and the behavior of the restricted volume of a big divisor on a smooth (complex) projective variety. Moreover, we give an analytic description of the restricted volume in…

Algebraic Geometry · Mathematics 2013-01-17 Shin-ichi Matsumura

In this paper, we prove that principal circle bundles over the complex projective space equipped with the standard Sasakian structures are volume rigid among all $K$-contact manifolds satisfying positivity conditions of tensors involing the…

Differential Geometry · Mathematics 2017-12-12 Paul W. Y. Lee