Entanglement and excitations in gauge/gravity duality

全息方法被用来研究具有全息对偶的理论中的现象，特别是包括非平衡稳态、量子杂质和量子可压缩物质在内的凝聚态系统的模型。所研究的基本量是纠缠熵和这类理论的激发谱。规范/重力对偶性提供了一种在传统方法失效的情况下进行计算的工具，例如，人们可以在远离流体动力状态的情况下研究这些系统的激发，从而允许对强耦合系统的行为有新的见解。

Holographic methods are used to investigate phenomena in theories with holographic duals, particularly models of condensed matter systems including non-equilibrium steady states, quantum impurities and quantum compressible matter. The primary quantities studied are the entanglement entropy and the spectrum of excitations of such theories. Gauge/gravity duality provides a tool for computation in regimes where more traditional techniques break down, for example one can study the excitations of these systems away from the hydrodynamic regime, thus allowing for new insights into the behavior of strongly coupled systems.