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Home » UC Berkeley Colloquium: Different approaches to the virtual moduli cycle -- an elementary introduction

Seminar

UC Berkeley Colloquium: Different approaches to the virtual moduli cycle -- an elementary introduction April 12, 2018 (04:10 PM PDT - 05:00 PM PDT)
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Location: 60 Evans Hall
Speaker(s) Dusa McDuff (Barnard College)
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http://events.berkeley.edu/index.php/calendar/sn/math.html?event_ID=116887

Most invariants of a symplectic manifold derive in some way from a count of J-holomorphic curves. However, in a general symplectic manifold one often cannot count curves directly in a robust way, i.e. so that the count is independent of the choice of perturbation. Instead one has to define a virtual count. This talk will try to give an elementary description of the problem and will describe some recent approaches to it.

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