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SUMMARY:Universality in string interactions - Oliver Schlotterer (Max-Plan
 ck-Institut für Gravitationphysik )
DTSTART:20160701T080000Z
DTEND:20160701T090000Z
UID:TALK66637@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:Co-Authors: Yu-tin Huang (National Taiwan University)\, Congka
 o Wen (Tor Vergata Rome)<br><span><br><br>In this talk based on arXiv:1602
 .01674\, we provide evidence for universality in the low-energy expansion 
 of tree-level string interactions. More precisely\, in the $\\alpha&#39\;$
 -expansion of tree-level scattering amplitudes\, we conjecture that the le
 ading transcendental coefficient at each order in $\\alpha&#39\;$ is unive
 rsal for all perturbative string theories. We have checked this universali
 ty up to seven points and trace its origin to the ability to restructure t
 he disk integrals of open bosonic string into those of the superstring. Th
 e accompanying kinematic functions have the same low-energy limit and do n
 ot introduce any transcendental numbers in their $\\alpha&#39\;$-correctio
 ns. Universality in the closed-string sector then follows from the Kawai-L
 ewellen-Tye-relations.<br></span>
LOCATION:Seminar Room 1\, Newton Institute
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