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For a smooth, projective family of homogeneous varieties defined over a number field, we show that if potential density holds for the rational points of the base, then it also holds for the total space. A conjecture of Campana and…

Algebraic Geometry · Mathematics 2011-02-22 J. -L. Colliot-Thélène , J. N. Iyer

We prove several vanishing theorems for the cohomology of balanced hyperbolic manifolds that we introduced in our previous work and for the $L^2$ harmonic spaces on the universal cover of these manifolds. Other results include a Hard…

Complex Variables · Mathematics 2022-02-15 Samir Marouani , Dan Popovici

In this paper we try to generalize the Haefliger theorem on completly solvable Lie foliations. We prove that: every completely solvable Lie foliation on a compact manifold is the inverse image of a homogenus foliation. Every manifold in…

Differential Geometry · Mathematics 2018-02-23 Ameth Ndiaye

Consider the moduli functor of canonically polarized complex manifolds with Hilbert polynomial h, and let M_h be the corresponding coarse quasi-projective moduli scheme. We show that M_h is Brody hyperbolic in the following sense: Assume…

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

We introduce the notion of topological hyperbolicity to characterize the largeness of the topological fundamental group of a complex variety. Inspired by the Shafarevich conjecture, we propose to study the topological hyperbolicity of…

Algebraic Geometry · Mathematics 2024-11-01 Xin Lü , Ruiran Sun , Kang Zuo

We show that very general hypersurfaces in odd-dimensional simplicial projective toric varieties verifying a certain combinatorial property satisfy the Hodge conjecture (these include projective spaces). This gives a connection between the…

Algebraic Geometry · Mathematics 2021-10-12 Ugo Bruzzo , Antonella Grassi

We establish the Hodge conjecture for some subvarieties of a class of toric varieties. First we study quasi-smooth intersections in a projective simplicial toric variety, which is a suitable notion to generalize smooth complete intersection…

Algebraic Geometry · Mathematics 2021-11-23 Ugo Bruzzo , William D. Montoya

It was conjectured by Lang that a complex projective manifold is Kobayashi hyperbolic if and only if it is of general type together with all of its subvarieties. We verify this conjecture for projective manifolds whose universal cover…

Complex Variables · Mathematics 2024-04-17 Sébastien Boucksom , Simone Diverio

We describe the standard and Leray filtrations on the cohomology groups with compact supports of a quasi projective variety with coefficients in a constructible complex using flags of hyperplane sections on a partial compactification of a…

Algebraic Geometry · Mathematics 2009-01-07 Mark Andrea A. de Cataldo

This article generalises to K\"ahler orbifolds general results on uniformisation of compact K\"ahler manifolds such as the Shafarevich conjecture for linear fundamental groups.

Algebraic Geometry · Mathematics 2013-02-21 Philippe Eyssidieux

We prove that every robustly transitive and every stably ergodic symplectic diffeomorphism on a compact manifold admits a dominated splitting. In fact, these diffeomorphisms are partially hyperbolic.

Dynamical Systems · Mathematics 2007-05-23 Ali Tahzibi , Vanderlei Horita

The main result of this note is an effective uniform bound for the number of deformation types of certain nonisotrivial families of canonically polarized manifolds. It extends the author's earlier such bound for the classical Shafarevich…

Algebraic Geometry · Mathematics 2010-06-21 Gordon Heier

The Chen-Ng\^o Conjecture predicts that the Hitchin morphism from the moduli stack of $G$-Higgs bundles on a smooth projective variety surjects onto the space of spectral data. The conjecture is known to hold for the group $GL_n$ and any…

Algebraic Geometry · Mathematics 2025-10-09 Matthew Huynh

We extend the Siu--Beauville theorem to a certain class of compact Kaehler--Weyl manifolds, proving that they fiber holomorphically over hyperbolic Riemannian surfaces whenever they satisfy the necessary topological hypotheses. As…

Differential Geometry · Mathematics 2009-12-08 G. Kokarev , D. Kotschick

In this paper we give a new and simplified proof of the variational Hodge conjecture for complete intersection cycles on a hypersurface in projective space.

Algebraic Geometry · Mathematics 2023-10-10 Remke Kloosterman

We prove some results on effective very ampleness and projective normality for some varieties with trivial canonical bundle. In the first part we prove an effective projective normality result for an ample line bundle on regular smooth…

Algebraic Geometry · Mathematics 2019-10-01 Jayan Mukherjee , Debaditya Raychaudhury

A conjecture of Mumford predicts a complete set of relations between the generators of the cohomology ring of the moduli space of rank 2 semi-stable sheaves with fixed odd degree determinant on a smooth, projective curve of genus at least…

Algebraic Geometry · Mathematics 2021-03-18 Ananyo Dan , Inder Kaur

Assume that the section conjecture holds over number fields. We prove then that it holds for a broad class of curves defined over finitely generated extensions of $\mathbb{Q}$. This class contains every projective, hyperelliptic curve,…

Number Theory · Mathematics 2023-03-02 Giulio Bresciani

We prove the strong Weinstein conjecture for closed contact manifolds that appear as the concave boundary of a symplectic cobordism admitting an essential local foliation by holomorphic spheres.

Symplectic Geometry · Mathematics 2016-10-21 Stefan Suhr , Kai Zehmisch

We show that Lang's hyperbolic and function version conjectures hold for surfaces $S$ of general type having a fibration of general type onto a curve $C$. The notion of multiplicity used is natural, but not classical, which leds to orbifold…

Algebraic Geometry · Mathematics 2007-05-23 Frédéric Campana