Abstract:
This survey presents a generalization of the notion of a toric structure on a compact symplectic manifold: the notion of a pseudotoric structure. The language of these new structures appears to be a convenient and natural tool for describing many non-standard Lagrangian submanifolds and cycles (Chekanov's exotic tori, Mironov's cycles in certain particular cases, and others) as well as for constructing Lagrangian fibrations (for example, special fibrations in the sense of Auroux on Fano varieties). Known properties of pseudotoric structures and constructions based on these properties are discussed, as well as open problems whose solution may be of importance in symplectic geometry and mathematical physics.
Bibliography: 28 titles.
This paper was written with the support of the programme “Increasing the Competitiveness of Leading Universities of the Russian Federation” (project no. 5-100).
This publication is cited in the following 3 articles:
N. A. Tyurin, “Lagrangian geometry of algebraic manifolds”, Phys. Part. Nuclei Lett., 19:4 (2022), 337
N. A. Tyurin, “Mironov Lagrangian cycles in algebraic varieties”, Sb. Math., 212:3 (2021), 389–398
Nikolai A. Tyurin, “Monotonic Lagrangian Tori of Standard and Nonstandard Types in Toric and Pseudotoric Fano Varieties”, Proc. Steklov Inst. Math., 307 (2019), 267–280