On the strong coupling expansion in the su(1|1) sector of N=4 SYM

Details On the strong coupling expansion in the su(1|1) sector of N=4 SYM On the strong coupling expansion in the su(1|1) sector of N=4 SYM

2008-05-08

arxiv.org/abs/0805.1180v2

JHEP 0806:063,2008

Physics

High Energy Physics

High Energy Physics - Theory

34 pages, 11 eps figures. v2: new references added

Scientific paper

10.1088/1126-6708/2008/06/063

We consider the anomalous dimension of the fermionic highest states Tr(psi^L) in the su(1|1) sector of N=4 SYM at strong coupling. In the thermodynamical L->OO limit it is described by a BES-like integral equation recently proposed by Rej, Staudacher and Zieme. The strong coupling regime of this equation is analyzed numerically and analytically by Neumann expansion methods which have been developed for the sl(2) sector. We compute analytically the first two terms of the strong coupling expansion and present numerical results for the next correction. We illustrate various specific features valid for the su(1|1) sector. In particular, at next-to-leading order, we find and solve a singular integral equation describing the scaling continuum limit of the Neumann coefficients.

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