Exacting N=4 Superconformal Symmetry
Exacting N=4 Superconformal Symmetry
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DOI：
10.1088/1126-6708/2009/11/056
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发表时间：
2009-05
影响因子：
5.4
通讯作者：
Till Bargheer;N. Beisert;W. Galléas;F. Loebbert;Tristan McLoughlin
中科院分区：
文献类型：
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作者：
Till Bargheer;N. Beisert;W. Galléas;F. Loebbert;Tristan McLoughlin
Tree level scattering amplitudes in N = 4 super Yang-Mills theory are al- most, but not exactly invariant under the free action of the N = 4 superconformal algebra. What causes the non-invariance is the holomorphic anomaly at poles where external par- ticles become collinear. In this paper we propose a deformation of the free superconformal representation by contributions which change the number of external legs. This modified classical representation not only makes tree amplitudes fully invariant, but it also leads to additional constraints from symmetry alone mediating between hitherto unrelated ampli- tudes. Moreover, in a constructive approach it appears to fully constrain all tree amplitudes when combined with dual superconformal alias Yangian symmetry.
