Related references
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Article
Physics, Particles & Fields
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Summary: This paper describes a class of holographic models that can describe the physics of certain four-dimensional big-bang/big-crunch cosmologies. The models involve a pair of 3D Euclidean holographic CFTs coupled to a 4D Euclidean CFT, resulting in a dual description resembling a wormhole.
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Geoff Penington et al.
Summary: Recent work has shown how to obtain the Page curve of an evaporating black hole through holographic computations of entanglement entropy. The validity of these computations is justified using the replica trick and geometries with a spacetime wormhole connecting the different replicas. The Page transition is studied in detail in a simple model by summing replica geometries with different topologies. Related quantities are computed in less detail in more complicated models like JT gravity coupled to conformal matter and the SYK model. Additionally, a direct gravitational argument for entanglement wedge reconstruction is given using the explicit formula known as the Petz map, where the spacetime wormhole plays a significant role. The interpretation of the wormhole geometries as part of some ensemble average implicit in the gravity description is also discussed.
JOURNAL OF HIGH ENERGY PHYSICS
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Astronomy & Astrophysics
Yoshiki Sato
Summary: In this paper, we study the time evolution of the subregion complexity in a two-dimensional conformal field theory with a moving mirror. We find that the subregion complexity shows a peculiar behavior, which is different from the entanglement entropy.
Article
Astronomy & Astrophysics
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Astronomy & Astrophysics
Ibrahim Akal et al.
Summary: This paper extensively studies moving mirrors in conformal field theories using field theoretic and holographic methods, focusing on escaping, kink, and double escaping mirror models. The holographic entanglement entropy calculations show the ideal Page curve in the kink mirror model and an interesting phase transition in the double escaping mirror model. Discussions also include the interpretation of moving mirrors in terms of two dimensional Liouville gravity and the connection between quantum energy conditions and the time evolution of holographic entanglement entropy.
CLASSICAL AND QUANTUM GRAVITY
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Summary: The study explores the entanglement evolution of boundary intervals in eternal Janus black holes embedded consistently into string theory in the low-energy limit. A transition in entanglement characteristics around the Page time is shown, indicating the unitarity of the evolution. Reproducing and reinterpreting these results from two different lower-dimensional perspectives reveals the feasibility of realizing double holography with gravity in two higher dimensions.
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Rong-Xin Miao
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(2021)
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(2021)
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Ibrahim Akal et al.
Summary: In this study, the time evolution of entanglement entropy in a two-dimensional conformal field theory with a moving mirror was calculated using holography. It was found that in a setup modeling Hawking radiation, entanglement entropy exhibits linear growth, which can be interpreted as the production of entangled pairs, while in a setup mimicking black hole formation and evaporation, the evolution follows the ideal Page curve. The gravity dual of the moving mirror model constructed via holography provides a concrete model to derive the Page curve for black hole radiation in the strong coupling regime of gravity.
PHYSICAL REVIEW LETTERS
(2021)
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Yiming Chen et al.
Summary: This text discusses two-dimensional CFT states produced by gravitational path integrals, focusing on cases of Euclidean AdS(2) evolution and Lorentzian dS(2) evolution followed by flat space evolution. It is found that naive hyperbolic space geometry leads to paradoxes, which can be resolved by incorporating bra-ket wormholes. Despite issues with divergent temperatures, projection onto low energy states reveals similarities with the previous Euclidean case, suggesting a connection between maximum entropy and de Sitter entropy.
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Summary: The study utilizes the replica method to compute the entanglement entropy of a universe without gravity entangled with a disjoint gravitating universe in a quantum state. It reveals that at high entanglement temperatures, the island in the gravitating universe contributes to a bound on entanglement entropy in a manner akin to evaporating black holes. Additionally, it demonstrates that the entanglement wedge of the non-gravitating universe expands with increasing entanglement temperature, ultimately allowing for complete reconstruction of the gravitating universe.
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(2021)
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Juan Hernandez et al.
Summary: In this study, holographic complexity in the doubly holographic model was examined to focus on the holographic complexity=volume (CV) proposal for boundary subregions in the island phase. By deriving the leading contributions to the complexity and interpreting them in terms of the generalized volume of the island, a generalization of the CV proposal for higher curvature theories of gravity was proposed. Consistency checks were provided by investigating Gauss-Bonnet gravity and f(Script capital R) gravity in the bulk.
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Mark Van Raamsdonk et al.
Summary: In this paper, the authors studied the properties of U(N) N = 4 SYM theory under specific boundary conditions, showing that boundary F decreases under boundary renormalization group flows, and the leading terms at large N in the supergravity and localization results agree.
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Mohsen Alishahiha et al.
Summary: By employing the extended island formula, we computed the entanglement entropy of Hawking radiation for black hole solutions of certain gravitational models containing higher derivative terms. Our results showed that despite the non-unitarity of the corresponding gravitational models, the entropy followed the Page curve, thanks to the contribution of the island.
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(2021)
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Vijay Balasubramanian et al.
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Yiming Chen et al.
Summary: Exact global symmetries are believed to not exist in theories with quantum black holes. This study proposes a method to quantify global symmetry violation in the Hawking radiation of a black hole using relative entropies. The violations of global symmetry considered are non-perturbative effects that contribute O(1) to relative entropy after the Page time, and these entropies can be computed within semi-classical gravity using island formulas.
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(2021)
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Hong Liu et al.
Summary: This study demonstrates that the Page curve can be explained by a simple dynamical input in the evolution of black holes, based on a recently proposed signature of quantum chaos, without relying on typicality. The operator gas approach is introduced to understand the evolution of the black hole's microstate. Void formation processes, where operators in the gas can jump outside the black hole, play a crucial role in leading to the Page curve.
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(2021)
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Wyatt Reeves et al.
Summary: The study suggests that a holographic CFT with a boundary added to it does not usually have a 'good' holographic dual with a localized gravitating end-of-the-world brane, due to restrictive constraints imposed by bulk causal structure. This implies that even higher-dimensional holographic duals of BCFTs may not be generic.
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(2021)
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Mark Van Raamsdonk
Summary: This passage discusses closed-universe big-bang/big-crunch cosmological spacetimes obtained from Euclidean wormholes, highlighting a holographic model for cosmology. It suggests key features for a general approach to cosmology using non-interacting copies of a Euclidean holographic CFT coupled with auxiliary degrees of freedom. The Lorentzian cosmological spacetime is encoded in a wavefunction of the universe living in the Hilbert space of the auxiliary degrees of freedom.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
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Astronomy & Astrophysics
Watse Sybesma
Summary: In de Sitter space, using the quantum Ryu-Takayanagi or island formula, entanglement entropy between states inside and outside the cosmological horizon was computed, resulting in the formation of an 'island' at the transition point which is significantly different from black hole horizons and may move back in time. These differences are crucial for non-violation of the no-cloning theorem in entanglement wedge reconstruction. Additionally, the introduction of a scrambling time reveals an entropy dependence expected for black holes.
CLASSICAL AND QUANTUM GRAVITY
(2021)
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Daniel Harlow et al.
Summary: This paper argues for a close connection between the absence of global symmetries in quantum gravity and a unitary solution to the black hole information problem. By analyzing recent calculations on evaporating black holes and discussing low-dimensional quantum gravity theories, the argument against global symmetries is extended to more realistic theories.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
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Physics, Particles & Fields
Kanato Goto et al.
Summary: This paper investigates replica wormholes for black holes formed by gravitational collapse in Jackiw-Teitelboim gravity, confirming that they lead to the island rule for entropy. The main technical challenge lies in the fact that replica wormholes rely on a Euclidean path integral, while the quantum extremal islands of an evaporating black hole exist only in Lorentzian signature.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Yi Ling et al.
Summary: The study investigates the information paradox of eternal black holes with charges in a doubly-holographic model, involving calculating entanglement entropy and proposing two strategies to address the paradox. The research aims to properly describe the black hole information paradox using enough degrees of freedom on the brane in the doubly-holographic setup.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
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Physics, Particles & Fields
Christoph F. Uhlemann
Summary: Variants of the black hole information paradox are studied in setups of Type IIB string theory realizing four-dimensional gravity coupled to a bath. Through fully backreacted solutions for configurations of D3, D5 and NS5 branes, along with their dual descriptions as N = 4 SYM and 3d T-rho(sigma)[SU(N)] SCFTs, island contributions to the entanglement entropy of black hole radiation systems have been identified, leading to Page curves. Analogous to the critical angles found in the Karch/Randall models, critical parameters in the brane configurations and dual field theories are identified in the 10-dimensional context.
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JOURNAL OF HIGH ENERGY PHYSICS
(2021)
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Netta Engelhardt et al.
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