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SUMMARY:On amplitudes and field redefinitions - David Sutherland (Universi
 ty of Glasgow)
DTSTART:20240223T160000Z
DTEND:20240223T170000Z
UID:TALK210046@talks.cam.ac.uk
CONTACT:Terry Generet
DESCRIPTION:All QFT Lagrangians are redundant\, in the sense that you can 
 locally and invertibly redefine its fields without changing its amplitudes
 . Much like gauge redundancy in gauge theory\, field redefinitions mix phy
 sics between different Feynman graphs\, and induce large cancellations bet
 ween graphs\, making amplitudes difficult to calculate.\n\nI will describe
  a compact functional formulation to describe the effects of field redefin
 itions and show how it can generate new off-shell recursion relations for 
 amplitudes\, based on arXiv:2202.06965 and arXiv:2312.06748. I will specul
 ate how an improved understanding of transformations under field redefinit
 ions could help calculate phenomenologically useful amplitudes more effici
 ently.
LOCATION:MR19 (Potter Room\, Pavilion B)\, CMS
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