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Holographic Complexity Equals Bulk Action

TLDR
The hypothesis that black holes are the fastest computers in nature is discussed and the conjecture that the quantum complexity of a holographic state is dual to the action of a certain spacetime region that is called a Wheeler-DeWitt patch is illustrated.
Abstract
We conjecture that the quantum complexity of a holographic state is dual to the action of a certain spacetime region that we call a Wheeler-DeWitt patch. We illustrate and test the conjecture in the context of neutral, charged, and rotating black holes in anti-de Sitter spacetime, as well as black holes perturbed with static shells and with shock waves. This conjecture evolved from a previous conjecture that complexity is dual to spatial volume, but appears to be a major improvement over the original. In light of our results, we discuss the hypothesis that black holes are the fastest computers in nature.

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Citations
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Double local quenches in 2D CFTs and gravitational force

TL;DR: In this article, the energy stress tensor and entanglement entropy for double joining and splitting local quenches were investigated in two-dimensional holographic and free Dirac fermion CFTs.
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Query complexity and cutoff dependence of the CFT 2 ground state

TL;DR: In this article, the authors present the vacuum of a two-dimensional conformal field theory as a network of Wilson lines in the Chern-Simons theory, which is conventionally used to study gravity in three-dimensional anti-de Sitter space.
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The Multi-faceted Inverted Harmonic Oscillator: Chaos and Complexity

TL;DR: In this paper, the inverted harmonic oscillator (IHO) was investigated with quantum chaos diagnostics such as the out-of-time-order correlator (OTOC) and circuit complexity.
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Evolution of complexity following a quantum quench in free field theory

TL;DR: In this article, the authors compute the time evolution of the complexity following a smooth mass quench characterized by a time scale δ t$ in a free scalar field theory, and show that the dynamics has two distinct phases, an early regime of approximately linear evolution followed by a saturation phase characterized by oscillations around a mean value.
References
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Journal ArticleDOI

The world as a hologram

TL;DR: In this article, the effects of particle growth with momentum on information spreading near black hole horizons were investigated. But the authors only considered the earliest times of the propagation of information near the horizon.
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A bound on chaos

TL;DR: In this paper, a sharp bound on the rate of growth of chaos in thermal quantum systems with a large number of degrees of freedom is given, based on plausible physical assumptions, establishing this conjecture.
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Black holes and the butterfly effect

TL;DR: In this article, the authors used holography to study sensitive dependence on initial conditions in strongly coupled field theories and showed that the effect of the early infalling quanta relative to the t = 0 slice creates a shock wave that destroys the local two-sided correlations present in the unperturbed state.
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The String landscape, black holes and gravity as the weakest force

TL;DR: In this paper, an upper bound on the strength of gravity relative to gauge forces in quantum gravity was given, motivated by arguments involving holography and absence of remnants, the stability of black holes as well as the non-existence of global symmetries in string theory.

Dimensional reduction in quantum gravity

TL;DR: In this article, Abdus Salam argued that the observable degrees of freedom can best be described as if they were Boolean variables defined on a two-dimensional lattice, evolving with time.
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