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Let $X$ be a complex projective variety, and let $E_{\ast}$ be a parabolic vector bundle on $X$. We introduce the notion of \textit{parabolic Seshadri constants} of $E_{\ast}$. It is shown that these constants are analogous to the classical…

Algebraic Geometry · Mathematics 2023-06-08 Indranil Biswas , Krishna Hanumanthu , Snehajit Misra , Nabanita Ray

We give a proof of the existence of radial (smooth) parallel sections of vector bundles endowed with a linear connection.

Differential Geometry · Mathematics 2018-01-23 Antonio J. Di Scala

A plane curve C defined by a homogeneous polynomial satisfying Laplace's equation appears canonically as the vanishing of the Pfaffian of a skew-symmetric matrix of linear forms. As a consequence there is a natural semi-stable rank two…

Algebraic Geometry · Mathematics 2009-06-24 Nigel Hitchin

Let X be a smooth projective variety defined over an algebraically closed field k. Nori constructed a category of vector bundles on X, called essentially finite vector bundles, which is reminiscent of the category of representations of the…

Algebraic Geometry · Mathematics 2009-12-21 Indranil Biswas , Joao Pedro P. dos Santos

This note is an attempt to generalize Bolibruch's theorem from the projective line to curves of higher genus. We show that an irreducible representation of the fundamental group of an open in a curve of higher genus has always a…

Algebraic Geometry · Mathematics 2007-05-23 Hélène Esnault , Eckart Viehweg

We show that the derived category of a curve is embedded into the derived category of the moduli space of vector bundles on the curve of coprime rank and degree. We also generalize the semiorthogonal decomposition constructed by Narasimhan…

Algebraic Geometry · Mathematics 2023-02-16 Kyoung-Seog Lee , Han-Bom Moon

Any arrangement of hyperplanes in general position in $P^n$ can be regarded as a divisor with normal crossing. We study the bundles of logarithmic 1-forms corresponding to such divisors` from the point of view of classification of vector…

alg-geom · Mathematics 2008-02-03 I. Dolgachev , M. Kapranov

The problem for consistency between linear transports along paths and real bundle metrics in real vector bundles is stated. Necessary and/or sufficient conditions, as well as conditions for existence, for such consistency are derived. All…

Differential Geometry · Mathematics 2007-05-23 Bozhidar Z. Iliev

In characteristic zero, semistable principal bundles on a nonsingular projective curve with a semisimple structure group form a bounded family, as shown by Ramanathan in 1970's using the Narasimhan-Seshadri theorem. This was the first step…

Algebraic Geometry · Mathematics 2007-05-23 Nitin Nitsure

In this short note, we provide an alternative proof of a notable theorem by Narasimhan and Ramanan. The theorem states that the moduli space of $S$-equivalence classes of semistable rank $2$ vector bundles over a curve $X$ of genus $2$ with…

Algebraic Geometry · Mathematics 2024-11-26 Jagadish Pine

We construct examples of non-isomorphic algebraic vector bundles on the punctured affine space with isomorphic pullbacks to the smooth quadric.

Group Theory · Mathematics 2013-03-05 Brent Doran , Jun Yu

We compare two constructions that associate to a semistable vector bundle on a Mumford curve a representation of the Schottky group and the algebraic fundamental group respectively.

Number Theory · Mathematics 2007-05-23 Gabriel Herz

We consider here the category of diffeological vector pseudo-bundles, and study a possible extension of classical differential geometric tools on finite dimensional vector bundles, namely, the group of automorphisms, the frame bundle, the…

Differential Geometry · Mathematics 2024-02-05 Jean-Pierre Magnot

We prove that the category of ``vector bundles on the absolute Fargues--Fontaine curve'' (more precisely the category of sections over some discrete algebraically closed field of the $v$-stack $\mathrm{Bun}_\mathrm{FF}$ of vector bundles on…

Number Theory · Mathematics 2022-12-23 Johannes Anschütz

We classify all isomorphisms between moduli stacks of vector bundles of fixed determinant on a smooth complex projective of genus at least 4. It is shown that each isomorphism between two different moduli stacks can be described as a…

Algebraic Geometry · Mathematics 2025-11-26 David Alfaya , Indranil Biswas , Tomás L. Gómez

It is known that a vector bundle E on a smooth projective curve Y defined over an algebraically closed field is semistable if and only if there is a vector bundle F on Y such that the cohomologies of E\otimes F vanish. We extend this…

Algebraic Geometry · Mathematics 2008-04-28 Indranil Biswas , Georg Hein

Let X be a geometrically connected smooth projective curve of genus one, defined over the field of real numbers, such that X does not have any real points. We classify the isomorphism classes of all stable real algebraic vector bundles over…

Algebraic Geometry · Mathematics 2007-06-01 Usha N. Bhosle , Indranil Biswas

We completely classify the possible extensions between semistable vector bundles on the Fargues-Fontaine curve (over an algebraically closed perfectoid field), in terms of a simple condition on Harder-Narasimhan polygons. Our arguments rely…

Number Theory · Mathematics 2023-06-22 Christopher Birkbeck , Tony Feng , David Hansen , Serin Hong , Qirui Li , Anthony Wang , Lynnelle Ye

We survey some recent progress in the theory of vector bundles on algebraic varieties and related questions in algebraic K-theory.

Algebraic Geometry · Mathematics 2021-11-08 Aravind Asok , Jean Fasel

The Hamiltonian theory of zero-curvature equations with spectral parameter on an arbitrary compact Riemann surface is constructed. It is shown that the equations can be seen as commuting flows of an infinite-dimensional field generalization…

High Energy Physics - Theory · Physics 2009-11-07 Igor Krichever