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DTSTART;TZID=America/New_York:20170215T150000
DTEND;TZID=America/New_York:20171214T160000
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SUMMARY:Random Matrix & Probability Theory Seminar (2016-2017)
DESCRIPTION:The random matrix and probability theory will be every Wednesday from 3pm-4pm in CMSA Building\, 20 Garden Street\, Room G10.
URL:https://cmsa.fas.harvard.edu/event/random-matrix-probability-theory-seminar-2016-2017/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Random Matrix & Probability Theory Seminar
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DTSTART;TZID=America/New_York:20170605T090000
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UID:10000032-1496653200-1496768400@cmsa.fas.harvard.edu
SUMMARY:A Celebration of Symplectic Geometry: 15 Years of JSG
DESCRIPTION:In celebration of the Journal of Symplectic Geometry’s 15th anniversary\, the Center of Mathematical Sciences and Applications will be hosting A Celebration of Symplectic Geometry: 15 Years of JSG on June 5-6\, 2017. \nConfirmed speakers: \n\nRoger Casals\, MIT\nChen He\, Northeastern University\nYael Karshon\, University of Toronto\nAilsa Keating\, Institute of Advanced Study\nEckhard Meinrenken\, University of Toronto\nAna Rita Pires\, Fordham University\nSobhan Seyfaddini\, Institute of Advanced Study\nAlejandro Uribe\, University of Michigan\nJonathan Weitsman\, Northeastern University\n\nThe conference is co-organized by Denis Auroux and Victor Guillemin. Additional information on the conference will be announced closer to the event. \nSchedule:\nJune 5\, Monday (Full day)\n\n\n\nTime\nSpeaker\nTopic\n\n\n8:30am – 9:0am\n\nBreakfast\n\n\n9:00am – 10:00am\nJonathan Weitsman\nTitle: On the geometric quantization of (some) Poisson manifolds\n\n\n10:30am – 11:30am\nEckhard Meinrenken\nTitle: On Hamiltonian loop group spaces \nAbstract: Let G be a compact Lie group. We explain a construction of an LG-equivariant spinor module over any Hamiltonian loop group space with proper moment map. It may be regarded as its `canonical spin-c structure’. We show how to reduce to finite dimensions\, resulting in actual spin-s structure on transversals\, as well as twisted spin-c structures for the associated quasi-hamiltonian space. This is based on joint work with Yiannis Loizides and Yanli Song.\n\n\n\n11:30am – 1:30pm\n\nBreak\n\n\n1:30pm – 2:30pm\nAna Rita Pires\nTitle: Infinite staircases in symplectic embedding problems \nAbstract: McDuff and Schlenk studied an embedding capacity function\, which describes when a 4-dimensional ellipsoid can symplectically embed into a 4-ball. The graph of this function includes an infinite staircase related to the odd index Fibonacci numbers. Infinite staircases have been shown to exist also in the graphs of the embedding capacity functions when the target manifold is a polydisk or the ellipsoid E(2\,3). I will describe how we use ECH capacities\, lattice point counts and Ehrhart theory to show that infinite staircases exist for these and a few other target manifolds\, as well as to conjecture that these are the only such target manifolds. This is a joint work with Cristofaro-Gardiner\, Holm and Mandini. \nVideo\n\n\n3:00pm – 4:00pm\nSobhan Seyfaddini\nTitle: Rigidity of conjugacy classes in groups of area-preserving homeomorphisms \nAbstract: Motivated by understanding the algebraic structure of groups of area-preserving homeomorphims F. Beguin\, S. Crvoisier\, and F. Le Roux were lead to the following question: Can the conjugacy class of a Hamiltonian homeomorphism be dense? We will show that one can rule out existence of dense conjugacy classes by simply counting fixed points. This is joint work with Le Roux and Viterbo.\n\n\n4:30pm – 5:30pm\nRoger Casals\nTitle: Differential Algebra of Cubic Graphs\nAbstract: In this talk we will associate a combinatorial dg-algebra to a cubic planar graph. This algebra is defined by counting binary sequences\, which we introduce\, and we shall provide explicit computations and examples. From there we study the Legendrian surfaces behind these constructions\, including Legendrian surgeries\, the count of Morse flow trees involved in contact homology\, and the relation to microlocal sheaves. Time permitting\, I will explain a connection to spectral networks.Video\n\n\n\nJune 6\, Tuesday (Full day) \n\n\n\nTime\nSpeaker\nTopic\n\n\n8:30am – 9:00am\n\nBreakfast\n\n\n9:00am – 10:00am\nAlejandro Uribe\nTitle: Semi-classical wave functions associated with isotropic submanifolds of phase space \nAbstract: After reviewing fundamental ideas on the quantum-classical correspondence\, I will describe how to associate spaces of semi-classical wave functions to isotropic submanifolds of phase space satisfying a Bohr-Sommerfeld condition. Such functions have symbols that are symplectic spinors\, and they satisfy a symbol calculus under the action of quantum observables. This is the semi-classical version of the Hermite distributions of Boutet the Monvel and Guillemin\, and it is joint work with Victor Guillemin and Zuoqin Wang. I will inlcude applications and open questions. \nVideo\n\n\n10:30am – 11:30am\nAlisa Keating\nTitle: Symplectomorphisms of exotic discs \nAbstract: It is a theorem of Gromov that the group of compactly supported symplectomorphisms of R^4\, equipped with the standard symplectic form\, is contractible. While nothing is known in higher dimensions for the standard symplectic form\, we show that for some exotic symplectic forms on R^{4n}\, for all but finitely n\, there exist compactly supported symplectomorphisms that are smoothly non-trivial. The principal ingredients are constructions of Milnor and Munkres\, a symplectic and contact version of the Gromoll filtration\, and Borman\, Eliashberg and Murphy’s work on existence of over-twisted contact structures. Joint work with Roger Casals and Ivan Smith. \nVideo\n\n\n11:30am – 1:30pm\n\nBreak\n\n\n1:30pm – 2:30pm\nChen He\nTitle: Morse theory on b-symplectic manifolds \nAbstract: b-symplectic (or log-symplectic) manifolds are Poisson manifolds equipped with symplectic forms of logarithmic singularity. Following Guillemin\, Miranda\, Pires and Scott’s introduction of Hamiltonian group actions on b-symplectic manifolds\, we will survey those classical results of Hamiltonian geometry to the b-symplectic case. \nVideo\n\n\n3:00pm – 4:00pm\nYael Karshon\nTitle: Geometric quantization with metaplectic-c structures \nAbstract: I will present a variant of the Kostant-Souriau geometric quantization procedure that uses metaplectic-c structures to incorporate the “half form correction” into the prequantization stage. This goes back to the late 1970s but it is not widely known and it has the potential to generalize and improve upon recent works on geometric quantization. \nVideo\n\n\n\n 
URL:https://cmsa.fas.harvard.edu/event/a-celebration-of-symplectic-geometry-15-years-of-jsg-june-5-6-2017/
LOCATION:20 Garden Street\, Cambridge\, MA 02138\, MA\, MA\, 02138\, United States
CATEGORIES:Conference,Event
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