We present a new infinite class of gravitational observables in asymptotically Anti-de Sitter space living on codimension-one slices of the geometry, the most famous of which is the volume of the maximal slice. We show that these observables display universal features for the thermofield-double state: they grow linearly in time at late times and reproduce the switch-back effect in shock wave geometries. We argue that any member of this class of observables is an equally viable candidate as the extremal volume for a gravitational dual of complexity.
Universal Time Evolution of Holographic and Quantum Complexity
RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS), RIKEN（理化学研究所跨学科理论与数学科学中心（iTHEMS））；School of Physics and Center of High Energy Physics, Peking University（北京大学物理学院高能物理中心）；Department of Physics, Nagoya University（名古屋大学物理系）
Codimension-Zero Holographic Complexity and Spectral Three-Point Correlators
RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS), RIKEN（理化学研究所交叉理论数学科学中心（iTHEMS））；School of Physics, Peking University（北京大学物理学院）；Center for High Energy Physics, Peking University（北京大学高能物理中心）；Department of Physics, Nagoya University（名古屋大学物理学系）
Probing the Singularity of Scalar-Haired Black Holes with Holographic Complexity
Laboratoire de Physique de l’École Normale Supérieure, ENS, Université PSL, CNRS, Sorbonne Université, Université de Paris（巴黎高等师范学院物理实验室，ENS，PSL大学，CNRS，索邦大学，巴黎大学）；Departement Physik, ETH Zürich（苏黎世联邦理工学院物理系）；Département de Physique, École Polytechnique, IP Paris（巴黎综合理工学院物理系）
