2017/01/30 by Brent Pym
Mathematics · Physics and Astronomy · #Algebraic Geometry and Number Theory #Algebraic geometry #Algebraic number #Degeneracy (biology) #Fano plane #Geometry and complex manifolds #Holomorphic function #Homotopy and Cohomology in Algebraic Topology #Poisson algebra #Poisson distribution #Poisson manifold #Symplectic geometry #math-ph #math.AG #math.MP #math.SG #msc:14J45 #msc:14N05 #msc:17B63 #msc:53D17
paper · pdf · doi:10.1007/s11005-017-0984-5
57 pages, 7 figures
arxiv created 2017/01/30 · openalex created_date 2017/02/10 · openalex publication_date 2017/09/13 · arxiv updated 2017/10/25 · openalex updated_date 2026/08/05
This paper is intended both as an introduction to the algebraic geometry of holomorphic Poisson brackets, and as a survey of results on the classification of projective Poisson manifolds that have been obtained in the past 20 years. It is based on the lecture series delivered by the author at the Poisson 2016 Summer School in Geneva. The paper begins with a detailed treatment of Poisson surfaces, including adjunction, ruled surfaces and blowups, and leading to a statement of the full birational classification. We then describe several constructions of Poisson threefolds, outlining the classification in the regular case, and the case of rank-one Fano threefolds (such as projective space). Following a brief introduction to the notion of Poisson subspaces, we discuss Bondal's conjecture on the dimensions of degeneracy loci on Poisson Fano manifolds. We close with a discussion of log symplectic manifolds with simple normal crossings degeneracy divisor, including a new proof of the classification in the case of rank-one Fano manifolds.