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This paper contains detailed proofs of our results on the moduli space and the structure of noncommutative 3-spheres. We develop the notion of central quadratic form for quadratic algebras, and a general theory which creates a bridge…

Quantum Algebra · Mathematics 2007-05-23 Alain Connes , Michel Dubois-Violette

After introducing a noncommutative counterpart of commutative algebraic geometry based on monoidal categories of quasi-coherent sheaves we show that various constructions in noncommutative geometry (e.g. Morita equivalences, Hopf-Galois…

Quantum Algebra · Mathematics 2007-07-16 Tomasz Maszczyk

This is an overview of recent results aimed at developing a geometry of noncommutative tori with real multiplication, with the purpose of providing a parallel, for real quadratic fields, of the classical theory of elliptic curves with…

Mathematical Physics · Physics 2010-03-19 Matilde Marcolli

We report on the following highlights from among the many discoveries made in Noncommutative Geometry since year 2000: 1) The interplay of the geometry with the modular theory for noncommutative tori, 2) Advances on the Baum-Connes…

Quantum Algebra · Mathematics 2019-10-24 Alain Connes

We analyse the moduli space and the structure of noncommutative 3-spheres. We develop the notion of central quadratic form for quadratic algebras, and prove a general algebraic result which considerably refines the classical homomorphism…

Quantum Algebra · Mathematics 2009-11-10 Alain Connes , Michel Dubois-Violette

After introducing a noncommutative counterpart of commutative algebraic geometry based on monoidal categories of quasi-coherent sheaves we show that various constructions in noncommutative geometry (e.g. Morita equivalences, Hopf-Galois…

Algebraic Geometry · Mathematics 2007-07-16 Tomasz Maszczyk

This article describes recent applications of algebraic geometry to noncommutative algebra. These techniques have been particularly successful in describing graded algebras of small dimension.

Rings and Algebras · Mathematics 2007-05-23 J. T. Stafford

We survey some aspects of the theory of noncommutative manifolds focusing on the noncommutative analogs of two-dimensional tori and low-dimensional spheres. We are particularly interested in those aspects of the theory that link the…

Quantum Algebra · Mathematics 2007-05-23 Jorge Plazas

Spatial noncommutativity is similar and can even be related to the non-Abelian nature of multiple D-branes. But they have so far seemed independent of each other. Reflecting this decoupling, the algebra of matrix valued fields on…

High Energy Physics - Theory · Physics 2009-10-31 Keshav Dasgupta , Zheng Yin

We introduce the notion of the moduli stack of relations of a quiver. When the quiver with relations is derived-equivalent to an algebraic variety, the corresponding compact moduli scheme can be viewed as a compact moduli of noncommutative…

Algebraic Geometry · Mathematics 2014-12-01 Tarig Abdelgadir , Shinnosuke Okawa , Kazushi Ueda

This article is a contribution to the project of classifying the torsion growth of elliptic curve upon base-change. In this article we treat the case of elliptic curve defined over the rationals with complex multiplication. For this…

Number Theory · Mathematics 2021-02-09 Enrique González-Jiménez

We introduce a category of noncommutative bundles. To establish geometry in this category we construct suitable noncommutative differential calculi on these bundles and study their basic properties. Furthermore we define the notion of a…

q-alg · Mathematics 2008-02-03 Markus J. Pflaum , Peter Schauenburg

The aim of the paper is to define noncommutative cluster structure on several algebras ${\mathcal A}$ related to marked surfaces possibly with orbifold points of various orders, which includes noncommutative clusters, i.e., embeddings of a…

Representation Theory · Mathematics 2025-08-14 Arkady Berenstein , Min Huang , Vladimir Retakh

We provide several families of compact complex curves embedded in smooth complex surfaces such that no neighborhood of the curve can be embedded in an algebraic surface. Different constructions are proposed, by patching neighborhoods of…

Algebraic Geometry · Mathematics 2024-07-30 Maycol Falla Luza , Frank Loray , Paulo Sad

Inspired by the commutator and anticommutator algebras derived from algebras graded by groups, we introduce noncommutatively graded algebras. We generalize various classical graded results to the noncommutatively graded situation concerning…

Rings and Algebras · Mathematics 2017-11-01 Patrik Nystedt

Classification of noncommutative quadric hypersurfaces is one of the major projects in noncommutative algebraic geometry. In recent years, we are dedicated to complete the classification of noncommutative central conics. To achieve this…

Rings and Algebras · Mathematics 2026-02-04 Haigang Hu , Izuru Mori , Wenchao Wu

Noncommutative Euclidean spaces -- otherwise known as Moyal spaces or quantum Euclidean spaces -- are a standard example of a non-compact noncommutative geometry. Recent progress in the harmonic analysis of these spaces gives us the…

Functional Analysis · Mathematics 2023-01-25 Edward McDonald

In noncommutative algebraic geometry, noncommutative quadric hypersurfaces are major objects of study. In this paper, we focus on studying noncommutative conics $\operatorname{Proj_{nc}} A$ embedded into Calabi-Yau quantum projective…

Rings and Algebras · Mathematics 2022-04-26 Haigang Hu , Masaki Matsuno , Izuru Mori

Boundary points on the moduli space of pointed curves corresponding to collisions of marked points have modular interpretations as degenerate curves. In this paper, we study degenerations of orbifold projective curves corresponding to…

Algebraic Geometry · Mathematics 2026-01-14 Tarig Abdelgadir , Daniel Chan , Shinnosuke Okawa , Kazushi Ueda

We give an explicit algorithm to compute a projective resolution of a module over the noncommutative ring based on the noncommutative Groebner bases theory.

Algebraic Topology · Mathematics 2009-06-09 Tomohiro Fukaya