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UID:568@qft.physik.hu-berlin.de
DTSTART;TZID=Europe/Berlin:20150529T130000
DTEND;TZID=Europe/Berlin:20150529T140000
DTSTAMP:20150528T233237Z
URL:https://qft.physik.hu-berlin.de/next-seminars/burkhard-eden-humboldt-u
 niversity-2/
SUMMARY:Burkhard Eden\, Humboldt University - Integral invariants\, unitari
 ty\, and the correlahedron
DESCRIPTION:We review twistor graphs for amplitudes and stress tensor corre
 lators in \nN=4 SYM\, focusing on the NMHV five-point tree example as a pe
 dagocial \ntesting ground. In both cases the diagrams have to sum into a u
 nique \nsuperconformal invariant independent of the reference twistor Z* \
 nintroduced by the gauge fixing.\n\nThe parallels in the graphical methods
  point at a generalisation of the \namplituhedron to the correlator case. 
 Finally\, we show that the Z* -&gt\; 0 \nlimit of any diagram corresponds 
 to a unitarity cut of the correlahedron \nform of the correlator.
CATEGORIES:Research Seminars
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DTSTART:20150329T030000
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