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Article
Physics, Particles & Fields
Shira Chapman et al.
Summary: We computed the length of spacelike geodesics in certain double-sided flow geometries in two dimensions. The results showed that in geometries with black hole horizons, the geodesic length exhibits linear growth at late times, while in flow geometries with de Sitter horizons, geodesics with finite length only exist for short times and do not exhibit linear growth. These results have implications for understanding the holographic proposal for quantum complexity and the holographic nature of the de Sitter horizon.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Beatrix Muhlmann
Summary: This article investigates the Euclidean gravitational path integral coupled with matter CFT and explores the semiclassical limit of timelike Liouville theory. By calculating the two-sphere partition function and comparing it with the DOZZ formula, some conclusions are obtained.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Vasudev Shyam
Summary: This study focuses on the T(T) over bar + Lambda(2) deformation of a Holographic CFT, which resides on the stretched cosmological horizon in dS(3) when the deformation parameter is tuned to a specific value. The findings reveal that it is possible to compute the entropy of the stretched cosmic horizon, taking into account the logarithmic correction.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Dionysios Anninos et al.
Summary: This study develops a one-dimensional (Conformal) Quantum Gravity model and establishes its effectiveness in computing the partition function of the Schwarzian theory. The non-localities in the model are related to the value of fixed gauge invariant moduli, and the properties of the model when all degrees of freedom fluctuate are also studied.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Batoul Banihashemi et al.
Summary: This article introduces the derivation of the entropy of a de Sitter horizon through introducing an artificial boundary and analyzing the statistical foundation. It also discusses the stabilization of the cosmological horizon in the canonical ensemble using a reservoir model.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Evan Coleman et al.
Summary: We obtain microstates and a subleading logarithmic correction accounting for the Gibbons-Hawking entropy in dS(3) by deforming a seed CFT with sparse light spectrum using the solvable T (T) over bar + Lambda(2). These microstates arise from the dressed CFT states near dimension Delta = c/6, which are associated with the Hawking-Page transition and dominate the real spectrum of the deformed theory. We demonstrate an analog of the Hawking-Page transition in de Sitter. Generalizations of the T (T) over bar + Lambda(2) deformation are necessary to handle model-dependent local bulk physics (subleading at large central charge) and higher dimensions.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Andrew Svesko et al.
Summary: This paper studies the semi-classical thermodynamics of two-dimensional de Sitter space in Jackiw-Teitelboim gravity, coupled with conformal matter. The study derives the quasi-local energy and the generalized entropy by introducing a timelike boundary in the static patch. The findings provide a first principles derivation of the island rule for U(1) symmetric dS(2) backgrounds.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Edgar Shaghoulian et al.
Summary: This paper expands on two recent proposals to generalize the Ryu-Takayanagi and Hubeny-Rangamani-Takayanagi formulas to de Sitter space, referred to as the monolayer and bilayer proposals. These proposals replace the boundary of AdS with the boundaries of static-patches or event horizons. The paper applies the rules of each proposal to various cases and demonstrates that they produce expected results. While the monolayer and bilayer proposals often yield the same results, they disagree in one specific situation. A better understanding of the thermodynamic limit of holographic systems is needed to definitively decide between the two.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Astronomy & Astrophysics
Patrick Draper et al.
Summary: This paper discusses the issue of Euclidean continuation for Schwarzschild-de Sitter black holes and proposes modifications to the gravitational path integral. By modifying the boundary conditions to construct the microcanonical partition function, two ensembles are brought into contact and the boundary is removed to produce closed systems containing both a black hole and a cosmological horizon.
Article
Astronomy & Astrophysics
Luca Griguolo et al.
Summary: In this paper, we investigate the nonperturbative structure of Jackiw-Teitelboim gravity at finite cutoff by proposing a formulation in terms of a T(T) over bar -deformed Schwarzian quantum mechanics. The perturbative expansion in the cutoff parameter is computed to all orders, and it is shown to be asymptotic with a precise completion based on the analytical properties of its Borel transform. The results are interpreted in terms of the nonperturbative branch of the T(T) over bar -deformed spectrum. The extension of this formalism to arbitrary topologies is also proposed, and exact expressions for general topologies are derived using the basic gluing rules. The results are consistent with the flow equation associated with the T(T) over bar deformation. Furthermore, the spectral form factor is studied in the slope and ramp regimes as functions of the cutoff parameter.
Article
Physics, Particles & Fields
Henry Maxfield et al.
Summary: The proposal suggests including a new class of topologies in the path integral of three-dimensional pure gravity to address negative aspects in the spectrum, leading to a nonperturbative shift of the BTZ extremality bound. A two-dimensional calculation using dimensionally reduced theory can capture the primary effects in the near extremal limit, as demonstrated through a study of a related two-dimensional theory of Jackiw-Teitelboim gravity with dynamic defects, which is shown to be equivalent to a matrix integral.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Dionysios Anninos et al.
Summary: The study focuses on the thermodynamic properties of two-dimensional geometries flowing away from an asymptotically AdS(2) spacetime from both macroscopic and microscopic perspectives. A precise map for constructing fixed background metrics and computationally tractable RG flows in SYK-type models at different temperatures is presented. In certain parameter regimes, the flow geometry is argued to interpolate between two (near) AdS(2) spacetimes, suggesting a transition between different spacetime geometries.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Dionysios Anninos et al.
Summary: The study examines the thermodynamic contributions to the three-dimensional de Sitter horizon from metric and Chern-Simons gauge field fluctuations. In the Euclidean signature, these are calculated by the gravity partition function coupled to matter semi-classically expanded about the round three-sphere saddle. The Lorentzian picture and the gravitational edge-mode theory at the de Sitter horizon are explored, drawing inspiration from topological entanglement entropy literature.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Mathematical
Edward Witten
Summary: This paper reviews the known boundary conditions in General Relativity on a spacetime of Euclidean signature, discussing the issues with the obvious Dirichlet boundary condition and proposing a more effective boundary condition for solving perturbation theory problems.
REVIEWS IN MATHEMATICAL PHYSICS
(2021)
Article
Physics, Particles & Fields
Dionysios Anninos et al.
Summary: The conjectured duality between multicritical matrix integrals (MMI) and a series of non-unitary minimal models was explored, matching critical exponents and revealing novel combinatorial expressions. The finiteness of the continuum theory was elaborated with consideration of BRST cohomology and supported by matrix integrals.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Dionysios Anninos et al.
Summary: We studied the Euclidean path integral of two-dimensional quantum gravity with positive cosmological constant coupled to conformal matter with large and positive central charge. Our analysis involved a semiclassical expansion around a round two-sphere saddle and working in the Weyl gauge, leading to a proposal for an all orders result for the two-dimensional gravitational partition function on the two-sphere, combined with insights from the DOZZ formula.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Beatrix Muhlmann
Summary: In the context of two-dimensional quantum gravity coupled to conformal matter and fixed area, we discuss the partition function on a round two-sphere. By considering the fixed area constraint and studying Feynman diagrams, we find that all ultraviolet divergences cancel up to two-loop order. Our results are compared with the two-sphere partition function obtained from the DOZZ formula.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Multidisciplinary
Luca Iliesiu et al.
Article
Astronomy & Astrophysics
David J. Gross et al.
Article
Physics, Particles & Fields
Victor Gorbenko et al.
JOURNAL OF HIGH ENERGY PHYSICS
(2019)
Article
Physics, Particles & Fields
Dionysios Anninos et al.
JOURNAL OF HIGH ENERGY PHYSICS
(2019)
Article
Astronomy & Astrophysics
Dionysios Anninos et al.
CLASSICAL AND QUANTUM GRAVITY
(2018)
Article
Physics, Particles & Fields
Xi Dong et al.
JOURNAL OF HIGH ENERGY PHYSICS
(2018)
Article
Physics, Particles & Fields
Alexei Kitaev et al.
JOURNAL OF HIGH ENERGY PHYSICS
(2018)
Article
Astronomy & Astrophysics
Juan Maldacena et al.
Article
Astronomy & Astrophysics
Tomas Andrade et al.
CLASSICAL AND QUANTUM GRAVITY
(2015)
Review
Physics, Nuclear
Dionysios Anninos
INTERNATIONAL JOURNAL OF MODERN PHYSICS A
(2012)
Article
Physics, Particles & Fields
Dionysios Anninos et al.
JOURNAL OF HIGH ENERGY PHYSICS
(2012)
Article
Physics, Particles & Fields
Dionysios Anninos et al.
JOURNAL OF HIGH ENERGY PHYSICS
(2010)
Article
Physics, Particles & Fields
Daniel Grumiller et al.
JOURNAL OF HIGH ENERGY PHYSICS
(2007)
Article
Physics, Particles & Fields
B Freivogel et al.
JOURNAL OF HIGH ENERGY PHYSICS
(2006)
Article
Astronomy & Astrophysics
BB Wang et al.
MODERN PHYSICS LETTERS A
(2001)
Article
Astronomy & Astrophysics
JC Niemeyer et al.
