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SUMMARY:The Harmony of Superstring Disk Amplitudes - Oliver Schlotterer (M
 PI\, Munich)
DTSTART:20120322T130000Z
DTEND:20120322T140000Z
UID:TALK37098@talks.cam.ac.uk
CONTACT:Sungjay Lee
DESCRIPTION:I will present the open string tree level amplitude of massles
 s states to any number of external legs. It turns out that the kinematic f
 actor of disk amplitudes is entirely captured by the underlying SYM field 
 theory\, i.e. that all the dependence on polarization vectors enters throu
 gh color ordered SYM amplitudes. Moreover\, the structure of the N point s
 tring theory amplitude exploits the minimal basis of (N-3)! SYM subamplitu
 des and adjoins a dual basis of (N-3)! hypergeometric functions encoding t
 he alpha' corrections. These patterns within disk amplitudes exhibit rich 
 implications from and to field theory.The pure spinor formalism is the cru
 cial tool to identify SYM amplitudes within the string computation. That i
 s why I introduce a compact representation for N point SYM amplitudes in p
 ure spinor superspace. It reflects the decomposition into cubic diagrams a
  la Bern\, Carrasco\, Johansson and generalizes Berends Giele recursion re
 lations.
LOCATION:Potter Room (first floor\, Pav. B)
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