paper

Precision calculation of 1/4-BPS Wilson loops in AdS

arXiv:1512.00841 · doi:10.1007/JHEP02(2016)105

Abstract

We study the strong coupling behaviour of -BPS circular Wilson loops (a family of "latitudes") in Super Yang-Mills theory, computing the one-loop corrections to the relevant classical string solutions in AdSS. Supersymmetric localization provides an exact result that, in the large 't Hooft coupling limit, should be reproduced by the sigma-model approach. To avoid ambiguities due to the absolute normalization of the string partition function, we compare the between the generic latitude and the maximal 1/2-BPS circle: Any measure-related ambiguity should simply cancel in this way. We use Gel'fand-Yaglom method to calculate the relevant functional determinants, that present some complications with respect to the standard circular case. After a careful numerical evaluation of our final expression we still find disagreement with the localization answer: The difference is encoded into a precise "remainder function". We comment on the possible origin and resolution of this discordance.

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