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Article
Physics, Particles & Fields
Hao Geng et al.
Summary: This paper investigates the potential problems of islands in standard theories of massless gravity. Islands are entanglement wedges disconnected from the asymptotic region, and in some known examples, the tension with the gravitational law is resolved by the presence of massive gravitons. Additionally, the authors derive some consistency conditions that islands in decoupled systems must satisfy.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Yuya Kusuki
Summary: Recently, boundary conformal field theories (BCFTs) have received much attention in the context of quantum gravity due to their dual relationship with gravity coupled to a heat bath CFT, known as the island model. This paper explores the properties of BCFTs and their application in braneworld holography by using the conformal bootstrap technique.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Mark Van Raamsdonk
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.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
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
(2022)
Article
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
Jani Kastikainen et al.
Summary: In this study, we compute correlation functions in holographic boundary conformal field theory using the geodesic approximation. We find agreement between the geodesic approximation and a more exact calculation for the 1-point function, and we also observe a factorization phase transition and anomalous boundary-localized BCFT operators in the 2-point function. Additionally, we derive a new expression for boundary entropy.
Article
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
(2021)
Article
Physics, Particles & Fields
Dongsu Bak et al.
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.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Rong-Xin Miao
Summary: In this paper, a codimension two holography called wedge holography is introduced as a generalization of AdS/CFT, with exact construction of gravitational solutions provided. The equivalence between wedge holography and AdS/CFT for vacuum Einstein gravity is proven, leading to insights on holographic Weyl anomaly, Entanglement/Renyi entropy and correlation functions. The study also extends to dS/CFT and flat space holography, revealing a unification of different holographic models in the framework of codimension two holography in asymptotically AdS.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Hong Zhe Chen et al.
Summary: This study examines the different scenarios of black hole mass changes when coupled to an auxiliary bath system, deriving a unitary Page curve through the holographic entanglement entropy and quantum extremal surface calculations. It also investigates the impact of entanglement wedge reconstruction on reconstructing the black hole interior from a subsystem containing Hawking radiation.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Multidisciplinary
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)
Article
Physics, Particles & Fields
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.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Vijay Balasubramanian et al.
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.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
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.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
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.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
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.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Vijay Balasubramanian et al.
Summary: We study black holes in 2D de Sitter JT gravity coupled to a CFT, entangled with matter in a non-gravitating universe. The entropy of the entangled matter increases indefinitely with entanglement strength, but must level off due to monogamy. The competition between field theory entanglement entropy and extremal islands in the de Sitter geometry plays a key role in stabilizing the entropy growth.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
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.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
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.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
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.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
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)
Article
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)
Article
Physics, Particles & Fields
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)
Article
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)
Article
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.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Jan Boruch et al.
Summary: This work elaborates on the holographic description of path-integral optimization using Hartle-Hawking wave functions in Anti-de Sitter spacetimes in conformal field theories. It argues that maximizing the Hartle-Hawking wave function is equivalent to the path-integral optimization procedure in CFT. The study shows that metrics maximizing gravity wave functions in particular holographic geometries precisely match those derived in the path-integral optimization procedure for their dual CFT states.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
Netta Engelhardt et al.
Summary: The text discusses the challenge of Euclidean wormholes to the standard quantum mechanical interpretation and suggests that gravitational path integral computes the ensemble average of multiple theories. It highlights the contribution of connected topologies to the free energy and evidence of replica symmetry breaking in both JT gravity and a simplified version of CGHS. The insights about ensemble averaging in gravity from this perspective are also discussed.
Article
Astronomy & Astrophysics
Jan Boruch et al.
Summary: This paper introduces a gravity dual description of path integral optimization in conformal field theories and discusses the equivalence between maximizing the Hartle-Hawking wave function and the path integral optimization procedure, as well as its application in various dimensions.
Article
Physics, Particles & Fields
Vijay Balasubramanian et al.
Summary: The study discusses a black hole entangled with an auxiliary radiation system in three-dimensional AdS space and proposes a realization of the ER=EPR scenario by combining with external radiation. By extending the Ryu-Takayanagi formula, it is found that the Page curve for evaporating black holes can be reproduced. Further research suggests limitations in reconstructing certain regions in the interior of Hawking radiation using subsystems at different stages.
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