Rutgers University Department of Physics and Astronomy
M4V File
Presentation Slides

Tom Hartman

Causality Sum Rules in Quantum Field Theory

In effective field theory, causality fixes the signs of certain interactions. I will describe how these Lorentzian constraints are encoded in the Euclidean theory, and use the conformal bootstrap to derive analogous causality constraints in CFT. The result is a position-space analogue of dispersion relations and the optical theorem. Applied to spinning fields, these constraints include the Hofman-Maldacena bounds derived from conformal collider physics. I will also discuss applications to holographic theories and non-conformal effective field theory.

For help, please contact James Tuan.