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arXiv · 2402.08414

$\mathcal{N}=2$ SYK models with dynamical bosons and fermions

Francesco Benini·Tomas Reis·Saman Soltani·Ziruo Zhang
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Abstract

We study a class of SYK models with $\mathcal{N}=2$ supersymmetry, described by $N$ fermions in chiral Fermi multiplets, as well as $\alpha N$ first-order bosons in chiral multiplets. The interactions are characterized by two integers $(p,q)$. We focus on the large $N$ and low energy limit of these models. Despite the presence of dynamical bosons, we find conformal behavior akin to the standard SYK model. We use $\mathcal{I}$-extremization of a Witten index to study the supersymmetric solutions. In particular, we find an exact expression for the entropy, which matches the numerical solutions to the Schwinger-Dyson equations. We further solve the model both in the large $p$ and large $p,q$ limits. Numerically, we verify our analytical results and obtain estimates for the Schwarzian coupling in the near zero-temperature limit. We also study the low-lying spectrum of operators to determine the parameter ranges where the Schwarzian mode dominates the IR dynamics. Lastly, we study out-of-time-ordered correlators to show that the model is maximally chaotic.

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Francesco Benini, Tomas Reis, Saman Soltani, Ziruo Zhang. 2024-02-13. $\mathcal{N}=2$ SYK models with dynamical bosons and fermions. https://doi.org/10.1103/jky3-v5dz

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