arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2303.04801hep-th
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二维引力与SYK模型中的极点跳跃点

Pole-skipping points in 2D gravity and SYK model

Haiming Yuan, Xian-Hui Ge, Keun-Young Kim, Chang-Woo Ji, Yongjun Ahn

AI总结:

该研究首次从引力与场论两侧探究二维极点跳跃现象,以标量场质量为自由度得到二维引力极点跳跃频率规律,发现JT引力与SYK模型极点跳跃点的一一对应及相关参数对应关系。

摘要:

我们首次同时从引力和场论两侧开展了极点跳跃(pole-skipping)现象的研究。与高维模型不同,(1+1)维体理论中不存在动量自由度,因此我们将标量场质量作为极点跳跃现象的自由度,而非动量。二维引力中标量场的极点跳跃频率与高维情形一致:对于正整数n,满足ω=-i2πTn。在每个上述频率下,都存在对应的极点跳跃质量,因此极点跳跃点存在于(ω,m)空间中。我们还计算了SYK模型在(ω,h)空间中的极点跳跃点,其中h为双线性原生算符的维度。研究发现,JT引力与SYK模型的极点跳跃点之间存在一一对应关系。为得到极点跳跃点,我们需要将与带电JT引力视界上化学势相关的参数ε,以及复SYK模型的粒子-空穴不对称参数ℰ作为偏移参数加以考虑,这凸显了与极点跳跃现象相关的ε-ℰ对应关系。

英文摘要:

We represent the first investigation of pole-skipping on both the gravity and field theory sides. In contrast to the higher dimensional models, there is no momentum degree of freedom in $(1+1)-$dimensional bulk theory. Thus, we then consider a scalar field mass as our degree of freedom for the pole-skipping phenomenon instead of momentum. The pole-skipping frequencies of the scalar field in 2D gravity are the same as higher dimensional cases: $ω=-i2πTn$ for positive integers $n$. At each of these frequencies, there is a corresponding pole-skipping mass, so the pole-skipping points exist in $(ω,m)$ space. We also compute the pole-skipping points of the SYK model in $(ω, h)$ space where $h$ is the dimension of the bilinear primary operator. We find that there is a one-to-one correspondence of the pole-skipping points between the JT gravity and the SYK model. To obtain the pole-skipping points, we need to consider the parameter $ε$ related to the chemical potential on the horizon of charged JT gravity and the particle-hole asymmetric parameter $\mathcal{E}$ of the complex SYK model as shift parameters. This highlights the $ε-\mathcal{E}$ correspondence in relation to pole-skipping phenomenon.

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