On classification of effective field theories

by Dr Karol Kampf (Charles University, Prague)

Friday 26 Apr 2019, 12:00 → 13:00 Europe/Madrid

IFAE seminar room (IFAE)

Description of low-energy interactions of Goldstone particles of spontaneously broken symmetries is traditionally done using the most general action based on the underlying symmetry. All such possible terms are taken up to a given order in the low energy expansion. The explicitly constructed Lagrangian can be then used for calculating given scattering amplitudes. However this process is not very efficient as can be demonstrated already at the tree-level for relatively small number of external particles. The modern amplitude methods offer different approach where it is possible to avoid redundancy stemming from the standard Feynman diagram calculations. The methods represent not only an efficient way of calculating scattering amplitudes but can be employed in theoretical studies of their interesting properties. This allowed among other things to classify the effective models. In this talk mainly spin-0 and spin-1 EFTs will be discussed.

kampf_ifae.pdf