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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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Traversable wormholes as quantum channels: exploring CFT entanglement structure and channel capacity in holography

TL;DR: In this article, the traversable wormhole in AdS/CFT was interpreted as both a quantum channel and entanglement witness, and protocols were defined that allow either the bounding of the channel's capacity or the determination of aspects of the structure between the two boundary CFTs.
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Action growth for black holes in modified gravity

TL;DR: In this paper, the general form of the action growth for a large class of static black hole solutions in modified gravity which includes $F(R)$-gravity models is computed, and an argument is put forward to provide a physical interpretation of the results.
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Holographic complexity in charged Vaidya black hole

TL;DR: In this paper, the authors use the complexity equals action conjecture to discuss the growth rate of the complexity in a charged AdS-Vaidya black hole formed by collapsing an uncharged spherically symmetric thin shell of null fluid.
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Surface/state correspondence and T T ¯ deformation

TL;DR: In this paper, the authors proposed that the quantum states of the two-dimensional $T\overline{T}$-deformed holographic conformal field theory (CFT) are dual to some particular surfaces in the ${\mathrm{AdS}}_{3}$ gravity.
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Complexity and Momentum

TL;DR: In this article, the authors investigate the higher dimensional generalizations of the connections between operator size, complexity, and the bulk radial momentum of an infalling object in the context of JT gravity and the SYK model.
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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