Diagrammatics of a colored SYK model and of an SYK-like tensor model, leading and next-to-leading orders

Abstract

The Sachdev-Ye-Kitaev (SYK) model is a model of $q$ interacting fermions. Gross and Rosenhaus have proposed a generalization of the SYK model which involves fermions with different flavors. In terms of Feynman graphs, those flavors are reminiscent of the colors used in random tensor theory. This gives us the opportunity to apply some modern, yet elementary, tools developed in the context of random tensors to one particular instance of such colored SYK models. We illustrate our method by identifying all diagrams which contribute to the leading and next-to-leading orders of the 2-point and 4-point functions in the large $N$ expansion, and argue that our method can be further applied if necessary. In a second part we focus on the recently introduced Gurau-Witten tensor model and also extract the leading and next-to-leading orders of the 2-point and 4-point functions. This analysis turns out to be remarkably more involved than in the colored SYK model.

References in corpus (5)

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• Random tensor models in the large N limit: Uncoloring the colored tensor models
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• Correlators in the $\mathcal{N}=2$ Supersymmetric SYK Model
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• SYK Model, Chaos and Conserved Charge
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• Supersymmetric SYK Model with Global Symmetry
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• Jackiw-Teitelboim Model Coupled to Conformal Matter in the Semi-Classical Limit
• Exact Solution of a Strongly Coupled Gauge Theory in 0+1 Dimensions
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