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This paper deals with singularities of genus 2 curves on a general (d_1,d_2)-polarized abelian surface (S,L). In analogy with Chen's results concerning rational curves on K3 surfaces [Ch1,Ch2], it is natural to ask whether all such curves…

Algebraic Geometry · Mathematics 2020-07-08 Andreas Leopold Knutsen , Margherita Lelli-Chiesa

We consider the question: which elliptic curves appear as the Jacobian of a smooth curve of genus one splitting a Severi--Brauer variety? We provide three new examples. First, we show that if $E$ is any elliptic curve over an algebraically…

Algebraic Geometry · Mathematics 2024-01-22 Eoin Mackall , Nick Rekuski

We explain a strategy for distinguishing Brill-Noether loci in the moduli space of curves by studying the lifting of linear systems on curves in polarized K3 surfaces, which motivates a conjecture identifying the maximal Brill-Noether loci…

Algebraic Geometry · Mathematics 2023-06-30 Asher Auel , Richard Haburcak

Let $k$ be a number field. We give an explicit bound, depending only on $[k:\mathbf{Q}]$ and the discriminant of the N\'{e}ron--Severi lattice, on the size of the Brauer group of a K3 surface $X/k$ that is geometrically isomorphic to the…

Number Theory · Mathematics 2022-08-08 Francesca Balestrieri , Alexis Johnson , Rachel Newton

This paper surveys the connection between the elliptic curve E_D: x^3 + y^3 = D and a certain metaplectic form on the cubic cover of GL(3) which has the property that its m,n^{th} Whittaker--Fourier coefficient is essentially the L--series…

Number Theory · Mathematics 2008-02-03 Daniel Lieman

We prove a conjecture of Maulik, Pandharipande, and Thomas expressing the Gromov--Witten invariants of K3 surfaces for divisibility two curve classes in all genus in terms of weakly holomorphic quasimodular forms of level two. Then, we…

Algebraic Geometry · Mathematics 2021-01-19 Younghan Bae , Tim-Henrik Buelles

Let $K$ be an algebraically closed, complete, non-Archimedean valued field of characteristic zero. We prove the non-Archimedean Green--Griffiths--Lang conjecture for projective surfaces of irregularity one. More precisely, we prove that if…

Algebraic Geometry · Mathematics 2025-02-18 Jackson S. Morrow

In this article we study Brill-Noether loci of moduli space of stable bundles over smooth surfaces. We define Petri map as an analogy with the case of curves. We show the non-emptiness of certain Brill-Noether loci over very general quintic…

Algebraic Geometry · Mathematics 2021-07-02 Krishanu Dan , Sarbeswar Pal

We consider higher-dimensional analogues of the classical Brauer-Siegel theorem focusing on the case of abelian varieties over global function fields. We prove such an analogue in the case of constant families of elliptic curves and abelian…

Algebraic Geometry · Mathematics 2007-12-25 B. E. Kunyavskii , M. A. Tsfasman

Atiyah classifies vector bundles on elliptic curves $E$ over an algebraically closed field of any characteristic. On the other hand, a rank $2$ vector bundle on $E$ defines a surface $S$ with a $\mathbb{P}^1$-bundle structure on $E$. We…

Algebraic Geometry · Mathematics 2022-12-02 Takato Togashi , Hokuto Uehara

Let X be a ruled surface over a nonsingular curve C of genus $g\geq0$. Let $M_H:=M_{X,H}(2;c_1,c_2)$ be the moduli space of H-stable rank 2 vector bundles E on X with fixed Chern classes $c_i:=c_i(E)$ for $i=1,2$. The main goal of this…

Algebraic Geometry · Mathematics 2024-01-23 L. Costa , I. Macías Tarrío

We give a construction that connects the Cauchy problem for Liouville elliptic equation with a certain initial value problem for mean curvature one surfaces in hyperbolic 3-space H3, and solve both of them. We construct the only mean…

Differential Geometry · Mathematics 2007-05-23 Jose A. Galvez , Pablo Mira

Cais, Ellenberg and Zureick-Brown recently observed that over finite fields of characteristic two, all sufficiently general smooth plane projective curves of a given odd degree admit a non-trivial rational 2-torsion point on their Jacobian.…

Number Theory · Mathematics 2020-12-10 Wouter Castryck , Marco Streng , Damiano Testa

Let k=F_q be a finite field of even characteristic. We obtain in this paper a complete classification, up to k-isomorphism, of non singular quartic plane curves defined over k. We find explicit rational normal models and we give closed…

Number Theory · Mathematics 2007-05-23 Enric Nart , Christophe Ritzenthaler

Brill-Noether loci ${\mathcal M}^r_{g,d}$ are those subsets of the moduli space ${\mathcal M}_g$ determined by the existence of a linear series of degree $d$ and dimension $r$. By looking at non-singular curves in a neighborhood of a…

Algebraic Geometry · Mathematics 2024-10-22 Montserrat Teixidor i Bigas

We briefly survey recent results related to linear series on curves that are general in various moduli spaces, highlighting the interplay between algebraic geometry on a general curve and the combinatorics of its degenerations.…

Algebraic Geometry · Mathematics 2021-11-02 David Jensen , Sam Payne

Let $\ell$ be an odd prime. We study the visibility theorem for certain elliptic curves over $\mathbb{Q}$ with additive reduction at $\ell$, and deduce the existence of nontrivial $\ell$-torsion in $\Sha(E^D/\mathbb{Q})$ for suitable…

Number Theory · Mathematics 2026-04-28 Asuka Shiga

In this paper, we study $\mathbb{A}^1$ curves on log K3 surfaces. We classify all genuine log K3 surfaces of type II which admits countably infinite $\mathbb{A}^1$ curves.

Algebraic Geometry · Mathematics 2017-05-17 Xi Chen , Yi Zhu

We prove that all elliptic curves defined over totally real cubic fields are modular. This builds on previous work of Freitas, Le Hung and Siksek, who proved modularity of elliptic curves over real quadratic fields, as well as recent…

Number Theory · Mathematics 2020-08-26 Maarten Derickx , Filip Najman , Samir Siksek

In this paper we complete the classification of the elliptic fibrations on K3 surfaces which admit a non-symplectic involution acting trivially on the N\'eron--Severi group. We use the geometric method introduced by Oguiso and moreover we…

Algebraic Geometry · Mathematics 2018-06-11 Alice Garbagnati , Cecília Salgado