2000 character limit reached
Categorification of Donaldson-Thomas invariants via Perverse Sheaves (1212.6444v5)
Published 23 Dec 2012 in math.AG
Abstract: We show that there is a perverse sheaf on a fine moduli space of stable sheaves on a smooth projective Calabi-Yau 3-fold, which is locally the perverse sheaf of vanishing cycles for a local Chern-Simons functional, possibly after taking an etale Galois cover. This perverse sheaf lifts to a mixed Hodge module and gives us a cohomology theory which enables us to define the Gopakumar-Vafa invariants mathematically.