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arXiv 2403.04673hep-th
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关于复q=2 SYK的注记

Notes on complex $q=2$ SYK

Benjamin James Pethybridge

AI总结:

本研究针对复q=2 SYK模型,计算低能CFT费米子四点函数OPE,发现红外整数权重算子列,给出其OPE系数闭式,分析共形对称性破缺缺失的影响及热力学性质,推进含SL(2,R)离散表示的全息模型研究。

摘要:

本注记厘清并拓展了复SYK模型在可解的q=2情形下的相关结果。我们计算了低能共形场论(CFT)中费米子的四点函数算子乘积展开(OPE),结果表明红外区存在一列整数权重算子。我们讨论了在这一特殊SYK情形下不存在破坏共形对称性的模式,以及该性质对共形不动点附近理论形变的影响。我们利用该模型的近自由结构,给出了整数权重算子OPE系数的闭式表达式。我们还探讨了与复情形和实情形下q=2 SYK热力学相关的解析与数值结果。该算子列按SL(2,R)的离散序列表示变换,这类表示为dS₂和AdS₂所共有。本工作延续了对包含此类表示的全息模型的讨论。

英文摘要:

This note clarifies and extends results on the complex SYK model to the solvable q = 2 case. We calculate the four point function OPE of fermions in the low energy CFT, implying the existence of a tower of integer-weight operators in the IR. We comment on the lack of a mode breaking conformal symmetry in this special case of SYK and the consequences for deformations of the theory near the conformal fixed point. We use the nearly-free structure of the model to provide a closed form expression for OPE coefficients of the integer-weight operators. We also discuss analytic and numerical results relevant to the thermodynamics of q = 2 SYK in both the complex and real case. The tower of operators transform in the discrete series of representations of SL(2,R), the representations shared by dS2 and AdS2. In this work we continue discussion of holographic models including these representations.

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