"Semi-classics, complex saddles and real path integrals"

Presented by Tin Sulejmanpasic, North Carolina State University

Friday, December 4, 2015, 2:00 pm — Small Seminar Room, Bldg. 510

I will discuss the use of semi-classics and instanton calculus and argue that, contrary to common wisdom, complex solutions of the equations of motion are a necessary ingredient of any semi-classical expansion. In particular, I will show that without the complex solutions semi-classical expansion of supersymmetric theories cannot be reconciled with supersymmetry. This has a natural interpretation in the Picard-Lefschetz theory.