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We give a lattice-theoretic classification of non-symplectic automorphisms of prime order of irreducible holomorphic symplectic manifolds of OG10 type. We determine which automorphisms are induced by a non-symplectic automorphism of prime…

Algebraic Geometry · Mathematics 2024-06-19 Simone Billi , Annalisa Grossi

We classify the symplectic automorphism groups for cubic fourfolds. The main inputs are the global Torelli theorem for cubic fourfolds and the classification of the fixed-point sublattices of the Leech lattice. Among the highlights of our…

Algebraic Geometry · Mathematics 2022-02-08 Radu Laza , Zhiwei Zheng

We determine the algebraic and transcendental lattices of a general cubic fourfold with a symplectic automorphism of prime order. We prove that cubic fourfolds admitting a symplectic automorphism of order at least three are rational, and we…

Algebraic Geometry · Mathematics 2025-12-11 Simone Billi , Annalisa Grossi , Lisa Marquand

In this article, we focus on a new perspective of automorphisms of complex 2-tori, reviewing previous works from a lattice-theoretic point of view. In particular, we give a classification of families of symplectic and non-symplectic…

Algebraic Geometry · Mathematics 2015-06-19 Giovanni Mongardi , Kévin Tari , Malte Wandel

We classify non-symplectic automorphisms of odd prime order on irreducible holomorphic symplectic manifolds which are deformations of Hilbert schemes of any number n of points on K3 surfaces, extending results already known for n=2. In…

Algebraic Geometry · Mathematics 2018-02-02 Chiara Camere , Alberto Cattaneo

We classify nonsymplectic automorphisms of prime order on irreducible holomorphic symplectic manifolds of O'Grady's 6-dimensional defamation type. More precisely, we give a classification of the invariant and coinvariant sublattices of the…

Algebraic Geometry · Mathematics 2022-02-10 Annalisa Grossi

In this paper we investigate when the generic member of a family of K3 surfaces admitting a non--symplectic automorphism of finite order admits also a symplectic automorphism of the same order. We give a complete answer to this question if…

Algebraic Geometry · Mathematics 2010-06-09 Alice Garbagnati , Alessandra Sarti

The present paper is devoted to the classification of symplectic automorphisms of some hyperk\"{a}hler manifolds. The results contained here are an explicit classification of prime order automorphisms on manifolds of $K3^{[n]}$ type and a…

Algebraic Geometry · Mathematics 2014-05-14 Giovanni Mongardi

In this note we present the classification of non-symplectic automorphisms of prime order on K3 surfaces, i.e.we describe the topological structure of their fixed locus and determine the invariant lattice in cohomology. We provide new…

Algebraic Geometry · Mathematics 2010-01-27 Michela Artebani , Alessandra Sarti , Shingo Taki

We give a classification of all non-symplectic automorphisms of prime order p acting on irreducible holomorphic symplectic fourfolds deformation equivalent to the Hilbert scheme of two points on a K3 surface, for p=2,3 and 7\leq p \leq 19.…

Algebraic Geometry · Mathematics 2016-09-07 Samuel Boissière , Chiara Camere , Alessandra Sarti

We characterize conjugacy classes of isometries of odd prime order in unimodular Z-lattices. This is applied to give a complete classification of odd prime order non-symplectic automorphisms of irreducible holomorphic symplectic manifolds…

Algebraic Geometry · Mathematics 2020-05-29 Simon Brandhorst , Alberto Cattaneo

We study automorphisms of order four on K3 surfaces. The symplectic ones have been first studied by Nikulin, they are known to fix six points and their action on the K3 lattice is unique. In this paper we give a classification of the purely…

Algebraic Geometry · Mathematics 2015-03-19 Michela Artebani , Alessandra Sarti

In this paper we provide a complete classification of non-symplectic automorphisms of order nine of complex K3 surfaces.

Algebraic Geometry · Mathematics 2019-04-04 Michela Artebani , Paola Comparin , María Elisa Valdés

We complete the classification of order $5$ nonsymplectic automorphisms on hyper-K\"ahler fourfolds deformation equivalent to the Hilbert square of a K3 surface. We then compute the topological Lefschetz number of natural automorphisms of…

Algebraic Geometry · Mathematics 2020-01-16 Samuel Boissière , Marc Nieper-Wißkirchen , Kévin Tari

The aim of this paper is to study algebraic K3 surfaces (defined over the complex number field) with a symplectic automorphism of prime order. In particular we consider the action of the automorphism on the second cohomology with integer…

Algebraic Geometry · Mathematics 2008-02-04 Alice Garbagnati , Alessandra Sarti

Given a positive definite even lattice and a commutative ring, there is a standard construction of a lattice vertex algebra over the commutative ring, and it admits a natural grading by non-negative integers. We describe the groups of…

Quantum Algebra · Mathematics 2026-02-18 Scott Carnahan , Hayate Kobayashi

We describe the outer automorphism group of a one-ended fundamental group of a graph of groups, when edge groups are cyclic, and vertex groups are torsion-free with cyclic centralizers. We show that in this case the outer automorphism group…

Group Theory · Mathematics 2025-07-23 Dario Ascari , Montserrat Casals-Ruiz , Ilya Kazachkov

In this paper we present a classification of non-symplectic automorphisms of K3 surfaces whose order is a multiple of seven by describing the topological type of their fixed locus. In the case of purely non-symplectic automorphisms, we…

Algebraic Geometry · Mathematics 2022-12-06 Renee Bell , Paola Comparin , Jennifer Li , Alejandra Rincón-Hidalgo , Alessandra Sarti , Aline Zanardini

A detailed proof is given of a theorem describing the centraliser of a transitive permutation group, with applications to automorphism groups of objects in various categories of maps, hypermaps, dessins, polytopes and covering spaces, where…

Group Theory · Mathematics 2018-05-25 Gareth A. Jones

We treat non-symplectic automorphisms on $K3$ surfaces which act trivially on the N\'{e}ron-Severi lattice. In this paper, we classify non-symplectic automorphisms of prime-power order, especially 2-power order on $K3$ surfaces, i.e., we…

Algebraic Geometry · Mathematics 2012-03-27 Shingo Taki
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