[Jlab-seminars] Theory Center Seminar

[Mary Fox]

Theory Center Seminar
Wed., March 26, 2014
2:00 p.m. (coffee at 1:45 p.m.)
CEBAF Center, Auditorium

Simon Caron-Huot
Niels Bohr Institute, Denmark

*Scattering Amplitudes and Their Hidden Symmetries*

I'll discuss an unexpected connection between the symmetries of the 
classical Kepler problem, and a special four-dimensional quantum field 
theory. The Kepler problem possess a non-obvious integral of motion, the 
Runge-Lenz vector, which ensures closure of the planetary orbits in the 
two-body approximation. The same symmetry in quantum mechanics accounts 
for the approximate degeneracies of the hydrogen atom, which are however 
broken by relativistic effects. In this talk I will show how the 
recently discovered integrability of the so-called N=4 super Yang-Mills 
model originates precisely from the Runge Lenz vector, providing a fully 
consistent quantum field theory model in which it is conserved. I will 
review some of its implications, in particular how it has led to the 
exact computation of the four- and five-particles amplitudes in this 
model to all values of the coupling, and how it severely constrains the 
higher-point amplitudes. Finally I will discuss recent developments 
concerning our understanding of collinear and Regge limits in this model.
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