Results 31 to 40 of about 178,240 (316)
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
doaj +1 more source
Matrix model formulation of four dimensional gravity [PDF]
, 2000 The attempt of extending to higher dimensions the matrix model formulation of two-dimensional quantum gravity leads to the consideration of higher rank tensor models.
Ambjorn +8 more
core +3 more sources
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 ...
openaire +5 more sources
Gravity as an ensemble and the moment problem
Journal of High Energy Physics, 2021 If a bulk gravitational path integral can be identified with an average of partition functions over an ensemble of boundary quantum theories, then a corresponding moment problem can be solved. We review existence and uniqueness criteria for the Stieltjes
Oliver Janssen +2 more
doaj +1 more source
Aspects of AdS2 quantum gravity and the Karch-Randall braneworld [PDF]
Journal of High Energy Physics, 2022 In this paper, we use the Karch-Randall braneworld to study theories of quantum gravity in two dimensional (nearly) anti-de Sitter space (AdS2). We focus on effective gravitational theories in the setup with two Karch-Randall branes embedded in an ...
H. Geng
semanticscholar +1 more source
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
doaj +1 more source
No Page curves for the de Sitter horizon
Journal of High Energy Physics, 2022 We investigate the fine-grained entropy of the de Sitter cosmological horizon. Starting from three-dimensional pure de Sitter space, we consider a partial reduction approach, which supplies an auxiliary system acting as a heat bath both at I $$ \mathcal ...
Joshua Kames-King +2 more
doaj +1 more source
NEW SPIN FOAM MODELS OF QUANTUM GRAVITY [PDF]
Modern Physics Letters A, 2005 We give a brief and a critical review of the Barret-Crane spin foam models of quantum gravity. Then we describe two new spin foam models which are obtained by direct quantization of General Relativity and do not have some of the drawbacks of the Barret-Crane models.
openaire +3 more sources
Renormalizable and Unitary Lorentz Invariant Model of Quantum Gravity [PDF]
Universe, 2021 We analyze the R+R2 model of quantum gravity where terms quadratic in the curvature tensor are added to the General Relativity action. This model was recently proved to be a self-consistent quantum theory of gravitation, being both renormalizable and unitary.
openaire +4 more sources
Discrete structures in gravity [PDF]
, 2000 Discrete approaches to gravity, both classical and quantum, are reviewed briefly, with emphasis on the method using piecewise-linear spaces. Models of 3-dimensional quantum gravity involving 6j-symbols are then described, and progress in generalising ...
Ambjørn J. +54 more
core +2 more sources