SMuK 2023 – scientific programme

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MP: Fachverband Theoretische und Mathematische Grundlagen der Physik

MP 11: Quantum Field Theory III (QED and Particle Detection)

MP 11.1: Talk

Thursday, March 23, 2023, 16:00–16:20, ZEU/0250

Asymptotic Completeness and Particle Detectors in Quantum Field Theory — •Janik Kruse — Adam Mickiewicz University in Poznań, Poland

A quantum field theory is asymptotically complete if every quantum state is a scattering state (i.e. a state that allows a particle interpretation). A physical criterion that is known to be necessary and sufficient for asymptotic completeness is the detector criterion: A quantum field theory is asymptotically complete if and only if every quantum state causes a click in some particle detector. In this talk, I will explain why particle detectors do not detect non-scattering states and how this result could be used to characterise asymptotically complete theories by more fundamental criteria than the detector criterion.