Results 11 to 20 of about 6,189 (307)
An outsider’s perspective on information recovery in de Sitter space
Journal of High Energy Physics, 2023 Entanglement islands play a crucial role in our understanding of how Hawking radiation encodes information in a black hole, but their relevance in cosmological spacetimes is less clear. In this paper, we continue our investigation of information recovery
Lars Aalsma +2 more
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The two-sphere partition function in two-dimensional quantum gravity
Journal of High Energy Physics, 2021 We study the Euclidean path integral of two-dimensional quantum gravity with positive cosmological constant coupled to conformal matter with large and positive central charge.
Dionysios Anninos +2 more
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The price of curiosity: information recovery in de Sitter space
Journal of High Energy Physics, 2021 Recent works have revealed that quantum extremal islands can contribute to the fine-grained entropy of black hole radiation reproducing the unitary Page curve.
Lars Aalsma, Watse Sybesma
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Effective gravitational action for 2D massive fermions
Journal of High Energy Physics, 2021 We work out the effective gravitational action for 2D massive Euclidean fermions in a small mass expansion. Besides the leading Liouville action, the order m 2 gravitational action contains a piece characteristic of the Mabuchi action, much as for 2D ...
Adel Bilal +2 more
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The two-sphere partition function from timelike Liouville theory at three-loop order
Journal of High Energy Physics, 2022 While the Euclidean two-dimensional gravitational path integral is in general highly fluctuating, it admits a semiclassical two-sphere saddle if coupled to a matter CFT with large and positive central charge. In Weyl gauge this gravity theory is known as
Beatrix Mühlmann
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SPIN-CUBE MODELS OF QUANTUM GRAVITY [PDF]
Reviews in Mathematical Physics, 2013 We study the state-sum models of quantum gravity based on a representation 2-category of the Poincaré 2-group. We call them spin-cube models, since they are categorical generalizations of spin-foam models. A spin-cube state sum can be considered as a path integral for a constrained 2-BF theory, and depending on how the constraints are imposed, a spin ...
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The phase structure of causal dynamical triangulations with toroidal spatial topology
Journal of High Energy Physics, 2018 We investigate the impact of topology on the phase structure of fourdimensional Causal Dynamical Triangulations (CDT). Using numerical Monte Carlo simulations we study CDT with toroidal spatial topology.
J. Ambjørn +4 more
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Midisuperspace Models of Canonical Quantum Gravity [PDF]
International Journal of Theoretical Physics, 1999 29 pages, RevTex, contribution to "Quantum Gravity in the Southern Cone II", Bariloche, Argentina, January 6-10 ...
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Bra-ket wormholes in gravitationally prepared states
Journal of High Energy Physics, 2021 We consider two dimensional CFT states that are produced by a gravitational path integral. As a first case, we consider a state produced by Euclidean AdS2 evolution followed by flat space evolution.
Yiming Chen +2 more
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SPIN FOAM MODELS OF QUANTUM GRAVITY [PDF]
Mathematical, Theoretical and Phenomenological Challenges Beyond the Standard Model, 2005 We give a short review of the spin foam models of quantum gravity, with an emphasis on the Barret-Crane model. After explaining the shortcomings of the Barret-Crane model, we briefly discuss two new approaches, one based on the 3d spin foam state sum invariants for the embedded spin networks, and the other based on representing the string scattering ...
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