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CATEGORIES:Quantum Fields and Strings Seminars
SUMMARY:The polarized scattering equations and super-ampli
tudes for gauge\, gravity and brane theories in 6\
, 10 and 11d - Lionel Mason (Oxford)
DTSTART;TZID=Europe/London:20200227T130000
DTEND;TZID=Europe/London:20200227T140000
UID:TALK137167AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/137167
DESCRIPTION:Six-dimensional theories provide a unification of
four-dimensional theories via dimensional reductio
n and access to some of the novel features arising
from M-theory. Ambitwistor strings directly gene
rate S-matrices for massless theories in terms of
formulae that localize on the solutions to the sca
ttering equations\; algebraic equations that deter
mine n points on the Riemann sphere from n massles
s momenta. These are sufficient to provide compac
t formulae for tree-level S-matrices for bosonic t
heories. This talk introduces their extension to t
he polarized scattering equations that arise from
twistorial versions of ambitwistor-strings. These
lead to simple explicit formulae for superamplitu
des in 6d for gauge\, gravity and brane theories
and the framework extends to 10 and 11 dimensions.
These satisfy a double copy principle that leads
to analogous formulae for theories containing ger
bes\, but their physical interpretation remaions c
ontroversial. This is based on joint work with Yvo
nne Geyer\, arxiv:1812.05548 and 1901.00134 and wi
th Giulia Albonico also 2001.05928.
LOCATION:Potter Room (first floor\, Pav. B)
CONTACT:Dr. Carl Turner
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