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Article
Physics, Particles & Fields
P. Betzios et al.
Summary: We studied a class of tripartite systems where two d-dimensional quantum field theories are cross-coupled via a third d+1-dimensional messenger quantum field theory. We analyzed in detail a specific example of one-dimensional matrix quantum mechanics coupled with a two-dimensional BF-type theory and computed their partition function and correlators. This construction can be extended to higher dimensions using a Chern-Simons messenger theory. In all such examples, the exact partition function takes a form speculated to correspond to systems dual to Euclidean wormholes, and the cross correlators exhibit soft behavior consistent with analogous gravitational calculations. We also studied another variant of the tripartite system, where the messenger theory is described by a non-self-interacting (matrix) field, reaching similar conclusions. While the Euclidean theories we considered are perfectly consistent, the two possible analytic continuations into Lorentzian signature of the tripartite models reveal physical features and pathologies resembling those of expected Lorentzian gravitational backgrounds.
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
Seamus Fallows et al.
Summary: Researchers found that in constructing closed FRW cosmology models, the requirement to avoid self-intersections limits the brane tension to T < T*, preventing the separation of scales between the brane and bulk curvature scales. Adding interface branes to the model does not change this condition.
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
Physics, Particles & Fields
Stefano Antonini et al.
Summary: This paper explores the effects of wormholes in flat big bang-big crunch cosmologies on the state of the coupled pair of 3D theories, and provides methods to reconstruct the wormhole geometry from certain physical quantities.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Chris Waddell
Summary: In this study, simple generalizations of a bottom-up holographic approach to cosmology were investigated, suggesting the need for further generalization of the model to obtain viable cosmological interpretations, such as including an Einstein-Hilbert term.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
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
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
Physics, Particles & Fields
James Sully et al.
Summary: This paper reproduces holographic results through direct (B)CFT calculations. Using the replica method, the entropies are related to correlation functions of twist operators in a Euclidean BCFT. These transitions between channels lead to the holographically observed phase transitions in entropies.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Joydeep Chakravarty
Summary: This work investigates how single-sided and eternal black holes can contain a vast number of semiclassical excitations in their interior, proposing a new solution to resolve the paradox in entropy. By describing the interior of black holes in Hilbert space, the resolution of the paradox arising from the orthogonal relationships between these excitations is provided.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Ahmed Almheiri et al.
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Article
Physics, Multidisciplinary
Stefano Antonini et al.
Article
Physics, Particles & Fields
Sean Cooper et al.
JOURNAL OF HIGH ENERGY PHYSICS
(2019)
Article
Physics, Particles & Fields
P. Betzios et al.
JOURNAL OF HIGH ENERGY PHYSICS
(2019)
Article
Physics, Particles & Fields
Ben Freivogel et al.
JOURNAL OF HIGH ENERGY PHYSICS
(2019)
Article
Physics, Multidisciplinary
Tadashi Takayanagi
PHYSICAL REVIEW LETTERS
(2011)
Article
Physics, Particles & Fields
Mitsutoshi Fujita et al.
JOURNAL OF HIGH ENERGY PHYSICS
(2011)
Article
Physics, Particles & Fields
A Karch et al.
JOURNAL OF HIGH ENERGY PHYSICS
(2001)
