# Particle Physics Seminar

## Wednesday 1^{st} July 2020 at 13:30

Zoom

*(virtual tea, coffee and biscuits at 13:15)*
# Probabilities & Signalling in Quantum Field Theory

## Jeffrey Forshaw(Manchester University)

**Abstract**

I will talk about a way to compute transition probabilities that works directly at the level of probabilities and
not amplitudes. The formalism guarantees that the initial and final states are always linked by a chain of retarded
propagators, which means causality is manifest. It also has a nice diagrammatic approach that is different from the usual
Feynman one.