Transcendentality and Crossing

Details Transcendentality and Crossing Transcendentality and Crossing

2006-10-23

arxiv.org/abs/hep-th/0610251v2

J.Stat.Mech.0701:P01021,2007

Physics

High Energy Physics

High Energy Physics - Theory

31 pages, v2: partial proof of strong-coupling expansion, references added

Scientific paper

10.1088/1742-5468/2007/01/P01021

We discuss possible phase factors for the S-matrix of planar N=4 gauge theory, leading to modifications at four-loop order as compared to an earlier proposal. While these result in a four-loop breakdown of perturbative BMN-scaling, Kotikov-Lipatov transcendentality in the universal scaling function for large-spin twist operators may be preserved. One particularly natural choice, unique up to one constant, modifies the overall contribution of all terms containing odd zeta functions in the earlier proposed scaling function based on a trivial phase. Excitingly, we present evidence that this choice is non-perturbatively related to a recently conjectured crossing-symmetric phase factor for perturbative string theory on AdS_5xS^5 once the constant is fixed to a particular value. Our proposal, if true, might therefore resolve the long-standing AdS/CFT discrepancies between gauge and string theory.

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