Hydrodynamic modes and operator spreading in a long-range center-of-mass-conserving Brownian SYK model

Bai-Lin Cheng, Shao-Kai Jian, Zhi-Cheng Yang

We study a center-of-mass-conserving Brownian complex Sachdev-Ye-Kitaev model with long-range (power-law) interactions characterized by $1/r^{\eta }$. The kinetic constraint and long-ran…