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arXiv 1802.02160hep-th
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$γ$-扭曲${\cal N}=4$ SYM理论和渔网CFT的量子谱曲线

Quantum Spectral Curve of $γ$-twisted ${\cal N}=4$ SYM theory and fishnet CFT

Vladimir Kazakov

摘要:

我们回顾了平面${\cal\ N}=4$ SYM反常维数的量子谱曲线(QSC)形式,包括它的$γ$-形变.撇开它的推导,我们集中在制定的“最终产品”在其最一般的形式:一组最小的假设的代数结构和分析的PDMATHAMO系统-全系统的巴克斯特PDMATHAMO-功能的基础可积模型。$Q$系统的代数结构完全基于模型的(超)对称性,并由组织成哈斯图的$Q$函数的朗斯基公式有效地描述。当补充$Q$-函数的解析性条件时,它完全固定了可积模型谱的物理解集。首先以$gl(N)$和$gl(K|M)$海森堡(超)自旋链为例,给出了谱方程。超对称性$gl(K|M)$作为$gl(K+M)$系统的哈斯图的"旋转"而出现。这幅图有助于我们构造AdS $_5$/CFT $_4$-对偶谱的QSC形式,其中$Q$-函数具有更复杂的解析性约束,涉及无限分支的Riemann曲面和一组Riemann-Hilbert条件.作为QSC的一个应用例子,我们考虑了$γ$的一个特殊的双标度极限--扭曲的${\cal\ N}=4$ SYM,它结合了弱耦合和强虚扭曲。这导致了一种新型的非酉CFT,其主要由特定的可积且通常可计算的4D fishnet Feynman图主导。对于最简单的这样的模型-双标量理论-QSC退化成$Q$-系统的可积非紧海森堡自旋链共形,$SU(2,2)$对称性。我们应用QSC的巴克斯特方程的推导和量子化条件,特别是“车轮”渔网图,并审查他们的数值和分析结果。

英文摘要:

We review the quantum spectral curve (QSC) formalism for anomalous dimensions of planar ${\cal\ N}=4$ SYM, including its $γ$-deformation. Leaving aside its derivation, we concentrate on formulation of the "final product" in its most general form: a minimal set of assumptions about the algebraic structure and the analyticity of the $Q$-system -- the full system of Baxter $Q$-functions of the underlying integrable model. The algebraic structure of the $Q$-system is entirely based on (super)symmetry of the model and is efficiently described by Wronskian formulas for $Q$-functions organized into the Hasse diagram. When supplemented with analyticity conditions on $Q$-functions, it fixes completely the set of physical solutions for spectrum of an integrable model. First we demonstrate the spectral equations on the example of $gl(N)$ and $gl(K|M)$ Heisenberg (super)spin chains. Supersymmetry $gl(K|M)$ occurs as a "rotation" of the Hasse diagram for a $gl(K+M)$ system. This picture helps us to construct the QSC formalism for spectrum of AdS$_5$/CFT$_4$-duality, with more complicated analyticity constraints on $Q$-functions which involve an infinitely branching Riemann surface and a set of Riemann-Hilbert conditions. As an example of application of QSC, we consider a special double scaling limit of $γ$-twisted ${\cal\ N}=4$ SYM, combining weak coupling and strong imaginary twist. This leads to a new type of non-unitary CFT dominated by particular integrable, and often computable, 4D fishnet Feynman graphs. For the simplest of such models -- the bi-scalar theory -- the QSC degenerates into the $Q$-system for integrable non-compact Heisenberg spin chain with conformal, $SU(2,2)$ symmetry. We apply the QSC for derivation of Baxter equation and the quantization condition for particular, "wheel" fishnet graphs, and review numerical and analytic results for them.

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