Calendar

< 2020 >
March 15 - March 21
  • 15
    March 15, 2020
    No events
  • 16
    March 16, 2020

    **CANCELED** CMSA Special Lecture: Shiing-Shen Chern as a Great Geometer of 20th Century **CANCELED**

    4:00 PM-6:00 PM
    March 16, 2020
    1 Oxford Street, Cambridge, MA 02138

    No additional detail for this event.

  • 17
    March 17, 2020

    **CANCELED** Lifting cobordisms and Kontsevich-type recursions for counts of real curves **CANCELED**

    11:00 AM-12:00 PM
    March 17, 2020

    Kontsevich’s recursion, proved in the early 90s, is a recursion formula for the counts of rational holomorphic curves in complex manifolds. For complex fourfolds and sixfolds with a real structure (i.e. a conjugation), signed invariant counts of real rational holomorphic curves were defined by Welschinger in 2003. Solomon interpreted Welschinger’s invariants as holomorphic disk counts in 2006 and proposed Kontsevich-type recursions for them in 2007, along with an outline of a potential approach of proving them. For many symplectic fourfolds and sixfolds, these recursions determine all invariants from basic inputs. We establish Solomon’s recursions by re-interpreting his disk counts as degrees of relatively oriented pseudocycles from moduli spaces of stable real maps and lifting cobordisms from Deligne–Mumford moduli spaces of stable real curves (this is very different from Solomon’s approach).

  • 18
    March 18, 2020
    No events
  • 19
    March 19, 2020
    No events
  • 20
    March 20, 2020
    No events
  • 21
    March 21, 2020
    No events