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This article is the second part of the article we promised to write at the end of Section 1 of [FOOO15] (arXiv:1209.4410). (Part I appeared in [Part I] (arXiv:1503.07631).) We discuss the foundation of the virtual fundamental chain and…

Symplectic Geometry · Mathematics 2017-04-07 Kenji Fukaya , Yong-Geun Oh , Hiroshi Ohta , Kaoru Ono

This is an expository article on the theory of Kuranishi structure and is based on a series of pdf files we uploaded for the discussion of the google group named `Kuranishi' (with its administrator H. Hofer). There we replied to several…

Symplectic Geometry · Mathematics 2012-09-21 Kenji Fukaya , Yong-Geun Oh , Hiroshi Ohta , Kaoru Ono

A Kuranishi space is a topological space with a Kuranishi structure, defined by Fukaya and Ono. Kuranishi structures occur naturally on moduli spaces of J-holomorphic curves in symplectic geometry. This paper is a brief introduction to the…

Symplectic Geometry · Mathematics 2008-10-22 Dominic Joyce

This is the first part of the article we promised at the end of [FOOO13, Section 1]. We discuss the foundation of the virtual fundamental chain and cycle technique, especially its version appeared in [FOn] and also in [FOOO4, Section A1,…

Symplectic Geometry · Mathematics 2015-03-27 Kenji Fukaya , Yong-Geun Oh , Hiroshi Ohta , Kaoru Ono

A Kuranishi space is a topological space with a Kuranishi structure, defined by Fukaya and Ono. Kuranishi structures occur naturally on moduli spaces of J-holomorphic curves in symplectic geometry. Let Y be an orbifold and R a commutative…

Symplectic Geometry · Mathematics 2008-10-22 Dominic Joyce

We define Gromov--Witten invariants of exploded manifolds. The technical heart of this paper is a construction of a virtual fundamental class $[\mathcal K]$ of any Kuranishi category $\mathcal K$ (which is a simplified, more general version…

Symplectic Geometry · Mathematics 2019-06-26 Brett Parker

We develop a theory of complex Kuranishi structures on projective schemes. These are sufficiently rigid to be equivalent to weak perfect obstruction theories, but sufficiently flexible to admit global complex Kuranishi charts. We apply the…

Algebraic Geometry · Mathematics 2024-03-05 Jeongseok Oh , Richard P. Thomas

Consider a space $X$, such as a compact space of $J$-holomorphic stable maps, that is the zero set of a Kuranishi atlas. This note explains how to define the virtual fundamental class of $X$ by representing $X$ via the zero set of a map…

Symplectic Geometry · Mathematics 2019-02-13 Dusa McDuff

Kuranishi structures were introduced in the 1990s by Fukaya and Ono for the purpose of assigning a virtual cycle to moduli spaces of pseudoholomorphic curves that cannot be regularized by geometric methods. Their core idea was to build such…

Symplectic Geometry · Mathematics 2018-03-16 Dusa McDuff , Katrin Wehrheim

Kuranishi structures were introduced in the 1990s by Fukaya and Ono for the purpose of assigning a virtual cycle to moduli spaces of pseudoholomorphic curves that cannot be regularized by geometric methods. Their core idea was to build such…

Symplectic Geometry · Mathematics 2015-08-12 Dusa McDuff , Katrin Wehrheim

We construct algebraic virtual cycles that give us the cohomological field theories of Fan-Jarvis-Ruan invariants by integral transformations.

Algebraic Geometry · Mathematics 2018-11-19 Huai-Liang Chang , Young-Hoon Kiem , Jun Li

Kawasaki's formula is a tool to compute holomorphic Euler characteristics of vector bundles on a compact orbifold X. Let X be an orbispace with perfect obstruction theory which admits an embedding in a smooth orbifold. One can then…

Algebraic Geometry · Mathematics 2016-01-20 Valentin Tonita

We construct global Kuranishi charts for the moduli spaces of stable pseudoholomorphic maps to a closed symplectic manifold in all genera. This is used to prove a product formula for symplectic Gromov-Witten invariants. As a consequence we…

Symplectic Geometry · Mathematics 2024-07-25 Amanda Hirschi , Mohan Swaminathan

We define the contact homology algebra for any contact manifold and show that it is an invariant of the contact manifold. More precisely, given a contact manifold $(M,\xi)$ and some auxiliary data $\mathcal{D}$, we define an algebra…

Symplectic Geometry · Mathematics 2023-01-19 Erkao Bao , Ko Honda

Using homological perturbation theory, we develop a formal version of the miniversal deformation associated with a deformation problem controlled by a differential graded Lie algebra over a field of characteristic zero. Our approach…

Quantum Algebra · Mathematics 2018-12-17 Johannes Huebschmann

We construct the Kuranishi spaces, or in other words, the versal deformations, for the following classes of connections with fixed divisor of poles $D$: all such connections, as well as for its subclasses of integrable, integrable…

Algebraic Geometry · Mathematics 2010-10-11 Francois-Xavier Machu

Motivated by the definition of homotopy $L_\infty$ spaces, we develop a new theory of Kuranishi manifolds, closely related to Joyce's recent theory. We prove that Kuranishi manifolds form a $2$-category with invertible $2$-morphisms, and…

Differential Geometry · Mathematics 2016-02-02 Junwu Tu

This paper studies an algebraic invariant of virtual knots called the biquandle. The biquandle generalizes the fundamental group and the quandle of virtual knots. The approach taken in this paper to the biquandle emphasizes understanding…

Geometric Topology · Mathematics 2007-05-23 David Hrencecin , Louis H. Kauffman

We introduce a category of Kuranishi presentations, whose objects are a variant of the Kuranishi structures introduced by Fukaya and Ono, and which can be seen as a refinement of the version studied by Pardon. We then formulate the notion…

Symplectic Geometry · Mathematics 2022-11-24 Mohammed Abouzaid

We prove that the homology class induced by the rational pseudocycle constructed via domain-dependent perturbations by Cieliebak and Mohnke coincides with the homology class induced by the virtual fundamental class defined through Kuranishi…

Symplectic Geometry · Mathematics 2025-07-08 Yuguo Qin
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