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UID:637@qft.physik.hu-berlin.de
DTSTART;TZID=Europe/Berlin:20151106T130000
DTEND;TZID=Europe/Berlin:20151106T140000
DTSTAMP:20151025T071831Z
URL:https://qft.physik.hu-berlin.de/next-seminars/lutz-klaczynski-humboldt
 -university/
SUMMARY:Lutz Klaczynski\, Humboldt University - PhD defense: Haag's theorem
  in renormalisable quantum field theories
DESCRIPTION:\nIn the first part of my talk\, I will review a bunch of no-go
  theorems that directly refute the central ideas of the canonical (that is
 \, operator-theoretic) formalism of quantum field theory and discuss possi
 ble expedients. In particular\, I will argue that the most vicious one\, n
 amely Haag's theorem - which should come as no big surprise to physics - i
 s\, in fact\, in a sense circumvented by renormalisation.\nThe second part
  deals with Dyson-Schwinger and renormalisation group equations in QED and
  Yukawa theory which imply ODEs and fixed point equations for anomalous di
 mensions. I present some nonperturbative results regarding an ODE for the 
 photon's anomalous dimension and furthermore show that the fixed point equ
 ations encode under certain conditions what is known as the 'principle of 
 resurgence'\, meaning that the perturbative sector of a resurgent transser
 ies determines the nonperturbative one.
CATEGORIES:Research Seminars
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DTSTART:20151025T020000
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