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We study weak approximation on rationally connected varieties under an assumption of strong approximation for a "simple" variety or under Schinzel's hypothesis. We also get some unconditional results.

Number Theory · Mathematics 2021-09-10 Dasheng Wei

This paper contains a Kawamata-Viehweg-Koll\'ar type vanishing theorem for vector bundles. In order to formulate and prove this cleanly, we introduce a class of sheaves that automatically satisfies a vanishing theorem. This is obtained by…

Algebraic Geometry · Mathematics 2007-05-23 Donu Arapura

We extend the results of generic vanishing theory to polarizable real Hodge modules on compact complex tori, and from there to arbitrary compact K\"ahler manifolds. As applications, we obtain a bimeromorphic characterization of compact…

Algebraic Geometry · Mathematics 2016-10-11 Giuseppe Pareschi , Mihnea Popa , Christian Schnell

In this article, we study the relative negative K-groups $K_{-n}(f)$ of a map $f: X \to S $ of schemes. We prove a relative version of the Weibel conjecture i.e. if $f: X \to S$ is a smooth affine map of noetherian schemes with $\dim S=d$…

Algebraic Geometry · Mathematics 2019-06-18 Vivek Sadhu

We give a simple interpretation of the adapted complex structure of Lempert-Szoke and Guillemin-Stenzel: it is given by a polar decomposition of the complexified manifold. We then give a twistorial construction of an SO(3)-invariant…

Differential Geometry · Mathematics 2007-05-23 Roger Bielawski

We study an analogue of fibrations of topological spaces with the homotopy lifting property in the setting of C*-algebra bundles. We then derive an analogue of the Leray-Serre spectral sequence to compute the K-theory of the fibration in…

K-Theory and Homology · Mathematics 2008-10-02 Siegfried Echterhoff , Ryszard Nest , Herve Oyono-Oyono

Let X be a simplicial complex on the vertex set V. The rational Leray number L(X) of X is the minimal d such that the rational reduced homology of any induced subcomplex of X vanishes in dimensions d and above. Let \pi be a simplicial map…

Combinatorics · Mathematics 2014-02-26 Gil Kalai , Roy Meshulam

We extend to compact K\"ahler manifolds some classical results on linear representation of fundamental groups of complex projective manifolds. Our approach based on an interversion lemma for fibrations with tori versus general type…

Algebraic Geometry · Mathematics 2019-02-20 Frédéric Campana , Benoît Claudon , Philippe Eyssidieux

Using the stress energy tensor, we establish some monotonicity formulae for vector bundle-valued p-forms satisfying the conservation law, provided that the base Riemannian (resp. K\"ahler) manifolds poss some real (resp. complex)…

Differential Geometry · Mathematics 2012-03-27 Yuxin Dong , Hezi Lin

Let $(X,L_{X})$ be an $n$-dimensional polarized manifold. Let $D$ be a smooth hypersurface defined by a holomorphic section of $L_{X}$. In this paper, we show the existence of a complete K\"{a}hler metric on $X \setminus D$ whose scalar…

Differential Geometry · Mathematics 2023-03-07 Takahiro Aoi

Given an embedded smooth projective variety Y in CP^n, we show how the existence of a hypersurface with high multiplicity along Y, but of relatively low degree and log canonical near Y implies vanishing of higher cohomology for certain…

alg-geom · Mathematics 2008-02-03 Aaron Bertram

Nonvanishing theorems play a central role in birational geometry, since they derive geometric consequences from numerical information and constitute a crucial step towards abundance and semiampleness problems. General nonvanishing…

Algebraic Geometry · Mathematics 2025-10-22 Andreas Höring , Vladimir Lazić , Christian Lehn

A Weyl structure on a Riemannian manifold $(M,g)$ is a torsion-free linear connection $\nabla$ such that there is a $1$-form $\theta$ (called the Lee form) satisfying $\nabla g = 2\, \theta \otimes g$. We examine the case in which there…

Differential Geometry · Mathematics 2026-03-27 José Luis Carmona Jiménez

A geometric quantization of a K\"{a}hler manifold, viewed as a symplectic manifold, depends on the complex structure compatible with the symplectic form. The quantizations form a vector bundle over the space of such complex structures.…

dg-ga · Mathematics 2008-02-03 Viktor L. Ginzburg , Richard Montgomery

We study the notions of weak partial $b$-metric space and weak partial Hausdorff $b$-metric space. Moreover, we intend to generalize Nadler's theorem in weak partial $b$-metric space by using weak partial Hausdorff $b$-metric spaces. A…

General Topology · Mathematics 2018-11-20 Tanzeela Kanwal , Azhar Hussain

Let $K$ be an algebraically closed field of arbitrary characteristic. Let $A$ be an affine domain over $K$ with transcendence degree 1 which is not isomorphic to $K[x]$, and let $B$ be a domain over $K$. We show that the AK invariant…

Commutative Algebra · Mathematics 2007-05-23 Anthony J. Crachiola , Leonid Makar-Limanov

In this paper, we show several vanishing type theorems for $p$-harmonic $\ell$-forms on Riemannian manifolds ($p\geq2$). First of all, we consider complete non-compact immersed submanifolds $M^n$ of ${N}^{n+m}$ with flat normal bundle, we…

Differential Geometry · Mathematics 2017-04-18 Nguyen Thac Dung , Pham Trong Tien

The aim of this article is to introduce Vogel's localization theorem for classes of D-complexes: this generalization of Waldhausen's localization theorem is especially useful and powerful in that it gives an explicit and computable…

K-Theory and Homology · Mathematics 2007-05-23 Frank Bihler

We prove a Generic Vanishing Theorem for coherent sheaves on an abelian variety over an algebraically closed field $k$. When $k=\CC$ this implies a conjecture of Green and Lazarsfeld.

Algebraic Geometry · Mathematics 2007-05-23 Christopher D. Hacon

In this paper, we generalize construction of Seidel's long exact sequence of Lagrangian Floer cohomology to that of compact Lagrangian submanifolds with vanishing Malsov class on general Calabi-Yau manifolds. We use the framework of…

Symplectic Geometry · Mathematics 2015-01-14 Yong-Geun OH
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