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hep-th2009★ 116 cited
Exacting N=4 Superconformal Symmetry
Till Bargheer, Niklas Beisert, Wellington Galleas +2
Tree level scattering amplitudes in N=4 super Yang-Mills theory are almost, but not exactly invariant under the free action of the N=4 superconformal algebra. What causes the non-i…
hep-th2008★ 32 cited
Quantum Stability for the Heisenberg Ferromagnet
Till Bargheer, Niklas Beisert, Nikolay Gromov
Highly spinning classical strings on RxS^3 are described by the Landau-Lifshitz model or equivalently by the Heisenberg ferromagnet in the thermodynamic limit. The spectrum of this…