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Scattering amplitudes in quantum field theory

March 29, 2023 @ 12:30 pm - 1:30 pm

CMSA Colloquium 03.29.2023

Speaker: Ruth Britto (Trinity College Dublin)

Title: Scattering amplitudes in quantum field theory

Abstract: Particle collider experiments require a detailed description of scattering events, traditionally computed through sums of Feynman diagrams. However, it is not practical to evaluate Feynman diagrams directly for all significant scattering processes. Moreover, adding all diagrams reveals many cancellations: scattering amplitudes in theories such as QCD take remarkably simple forms. This simplicity is a clue that the perturbative theory is perhaps best understood without reference to Feynman diagrams. In fact, it has recently become possible to explain some of this simplicity. I will show how to derive many amplitudes efficiently and elegantly, and propose taming the remaining complexity with ideas drawn from combinatorics and geometry.


March 29, 2023
12:30 pm - 1:30 pm
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CMSA Room G10
CMSA, 20 Garden Street
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