Abstract
In this paper we extend and simplify previous results regarding the computation of Euclidean Wilson loops in the context of the AdS/CFT correspondence, or, equivalently, the problem of finding minimal area surfaces in hyperbolic space (Euclidean AdS3). If the Wilson loop is given by a boundary curve\( \overrightarrow{X} \)(s) we define, using the integrable properties of the system, a family of curves \( \overrightarrow{X} \)(λ, s) depending on a complex parameter λ known as the spectral parameter. This family has remarkable properties. As a function of λ, \( \overrightarrow{X} \)(λ, s) has cuts and therefore is appropriately defined on a hyperelliptic Riemann surface, namely it determines the spectral curve of the problem. Moreover, \( \overrightarrow{X} \)(λ, s) has an essential singularity at the origin λ = 0. The coefficients of the expansion of \( \overrightarrow{X} \)(λ, s) around λ = 0, when appropriately integrated along the curve give the area of the corresponding minimal area surface.
Furthermore we show that the same construction allows the computation of certain surfaces with one or more boundaries corresponding to Wilson loop correlators. We extend the area formula for that case and give some concrete examples. As the main example we consider a surface ending on two concentric circles and show how the boundary circles can be deformed by introducing extra cuts in the spectral curve.
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Kruczenski, M., Ziama, S. Wilson loops and Riemann theta functions II. J. High Energ. Phys. 2014, 37 (2014). https://doi.org/10.1007/JHEP05(2014)037
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DOI: https://doi.org/10.1007/JHEP05(2014)037