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Thermodynamical Property of Entanglement Entropy for Excited States

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TLDR
It is argued that the entanglement entropy for a very small subsystem obeys a property which is analogous to the first law of thermodynamics when the authors excite the system, and this provides a universal relationship between the energy and the amount of quantum information.
Abstract
We argue that the entanglement entropy for a very small subsystem obeys a property which is analogous to the first law of thermodynamics when we excite the system. In relativistic setups, its effective temperature is proportional to the inverse of the subsystem size. This provides a universal relationship between the energy and the amount of quantum information. We derive the results using holography and confirm them in two-dimensional field theories. We will also comment on an example with negative specific heat and suggest a connection between the second law of thermodynamics and the strong subadditivity of entanglement entropy.

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Gravitation from entanglement in holographic CFTs

TL;DR: In this article, it was shown that the set of such constraints for all ball-shaped spatial regions in the CFT is exactly equivalent to the requirement that the dual geometry satisfy the gravitational equations of motion, linearized about pure AdS.
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Relative entropy and holography

TL;DR: In this paper, the authors evaluate relative entropy between the vacuum and other states for spherical regions in the AdS/CFT framework, and show that the relevant equations and inequalities hold for a large class of states, giving a strong support to the holographic entropy formula.
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Holographic Entanglement Entropy from 2d CFT: Heavy States and Local Quenches

TL;DR: In this article, the authors considered the entanglement entropy in 2D conformal field theory in a class of excited states produced by the insertion of a heavy local operator, including both high-energy eigenstates of the Hamiltonian and time-dependent local quenches.
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Liouville Action as Path-Integral Complexity: From Continuous Tensor Networks to AdS/CFT

TL;DR: In this paper, an optimization procedure for Euclidean path-integrals that evaluate CFT wave functionals in arbitrary dimensions is proposed, where the optimization is performed by minimizing certain functional, which can be interpreted as a measure of computational complexity, with respect to background metrics for the pathintegrals.
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On the Architecture of Spacetime Geometry

TL;DR: In this paper, entanglement entropy is used as a probe of the architecture of spacetime in quantum gravity, and it is shown that the leading contribution to this entropy satisfies an area law for any sufficiently large region in a smooth spacetime, which, in fact, is given by the Bekenstein-Hawking formula.
References
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The Large N limit of superconformal field theories and supergravity

TL;DR: In this article, it was shown that the large-N limits of certain conformal field theories in various dimensions include in their Hilbert space a sector describing supergravityon the product of anti-de Sitter spacetimes, spheres, and other compact manifolds.
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Holographic Derivation of Entanglement Entropy from the anti de Sitter Space/Conformal Field Theory Correspondence

TL;DR: It is argued that the entanglement entropy in d + 1 dimensional conformal field theories can be obtained from the area of d dimensional minimal surfaces in AdS(d+2), analogous to the Bekenstein-Hawking formula for black hole entropy.
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Central Charges in the Canonical Realization of Asymptotic Symmetries: An Example from Three-Dimensional Gravity

TL;DR: In this article, it was shown that the global charges of a gauge theory may yield a nontrivial central extension of the asymptotic symmetry algebra already at the classical level.
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Entanglement entropy and quantum field theory

TL;DR: In this article, a systematic study of entanglement entropy in relativistic quantum field theory is carried out, where the von Neumann entropy is defined as the reduced density matrix ρA of a subsystem A of a 1+1-dimensional critical system, whose continuum limit is a conformal field theory with central charge c, and the results are verified for a free massive field theory.
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A Stress tensor for Anti-de Sitter gravity

TL;DR: In this paper, the boundary stress tensor associated with a gravitating system in asymptotically anti-de Sitter space is computed, and the conformal anomalies in two and four dimensions are recovered.
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