Kodosky Lecture Series, Theory Group Seminar

Dr. David Kosower, CEA-Saclay, IAS-Princeton

"Lectures on On-Shell Methods in Field Theory: II. The Unitarity Method”

12:00pm, RLM 9.222 (In lieu of GST this week; note special room.)

Joint Abstract for Lecture Series: The lectures give an introduction to on-shell methods for computing scattering amplitudes in quantum field theories.

The first presents spinor variables and the construction of basic interactions without a Lagrangian. I will also give a derivation of the Britto-Cachazo-Feng-Witten on-shell recursion relations.

The second lecture presents the framework for computing loop corrections to amplitudes. It describes the generalized unitarity approach, focusing on one-loop amplitudes.

The third lecture focuses on Feynman integrals at higher loops. It will include an overview of the appliction of integration-by-parts to reducing integrals, and to deriving differential equations.

I will also discuss recent advances in connecting integration by parts to aspects of the algebraic geometry of Feynman integrals.