Refined VafaWitten invariants for projective surfaces
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Seminar
Richard Thomas (Imperial London)  Seminar Algebraic Geometry (SAG)
What 


When 
Jun 14, 2018 from 10:30 am to 11:30 am 
Where  Bonn, HĂ¶rsaal MPI, Vivatsgasse 7 
Contact Name  Sachinidis 
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I'll describe how to define VafaWitten invariants  and refined VafaWitten invariants  of projective surfaces. Then I'll explain how to calculate some parts of the theory via degeneracy loci and "CarlssonOkounkov operators". The talk describes different projects joint with Yuuji Tanaka, Davesh Maulik and Amin Gholampour.