IAS Amplitudes Group Meeting
Physics of the Analytic S-Matrix - Lecture 4
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Abstract: You might've heard about various mathematical properties of scattering amplitudes such as analyticity, sheets, branch cuts, discontinuities, etc. What does it all mean? In these lectures, we'll take a guided tour through simple scattering problems that will allow us to directly trace such properties back to physics. We'll learn how different analytic features of the S-matrix are really consequences of causality, locality of interactions, unitary propagation, and so on.
This talk is a part of a series of lectures aimed at graduate students. The fourth one will focus on the theory of complex angular momenta and the Mandelstam representation.