Results 11 to 20 of about 173,760 (383)
MINISUPERSPACE MODEL FOR REVISED CANONICAL QUANTUM GRAVITY [PDF]
International Journal of Modern Physics D, 2004 We present a reformulation of the canonical quantization of gravity, as referred to the minisuperspace; the new approach is based on fixing a Gaussian (or synchronous) reference frame and then quantizing the system via the reconstruction of a suitable constraint; then the quantum dynamics is re-stated in a generic coordinates system and it becomes ...
Giovanni Montani
openalex +4 more sources
Towards the map of quantum gravity [PDF]
General Relativity and Gravitation, 2017 In this paper we point out some possible links between different approaches to quantum gravity and theories of the Planck scale physics. In particular, connections between loop quantum gravity, causal dynamical triangulations, Hořava–Lifshitz gravity ...
J. Mielczarek, T. Trześniewski
semanticscholar +5 more sources
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 ...
Aleksandar Miković
openalex +4 more sources
Lattice Models of Quantum Gravity [PDF]
, 1998 Standard Regge Calculus provides an interesting method to explore quantum gravity in a non-perturbative fashion but turns out to be a CPU-time demanding enterprise. One therefore seeks for suitable approximations which retain most of its universal features. The $Z_2$-Regge model could be such a desired simplification. Here the quadratic edge lengths $q$
Bittner, E. +5 more
openaire +4 more sources
Analogue spacetimes: toy models for "quantum gravity'' [PDF]
Proceedings of From Quantum to Emergent Gravity: Theory and Phenomenology — PoS(QG-Ph), 2008 Why are "analogue spacetimes'' interesting? For the purposes of this workshop the answer is simple: Analogue spacetimes provide one with physically well-defined and physically well-understood concrete models of many of the phenomena that seem to be part of the yet incomplete theory of "quantum gravity'', or more accessibly, "quantum gravity ...
Matt Visser
openalex +4 more sources
Spin foam models of Riemannian quantum gravity [PDF]
Classical and Quantum Gravity, 2002 Using numerical calculations, we compare three versions of the Barrett-Crane model of 4-dimensional Riemannian quantum gravity. In the version with face and edge amplitudes as described by De Pietri, Freidel, Krasnov, and Rovelli, we show the partition function diverges very rapidly for many triangulated 4-manifolds.
J. Daniel Christensen +3 more
openaire +11 more sources
Consistency of matter models with asymptotically safe quantum gravity [PDF]
, 2015 We discuss the compatibility of quantum gravity with dynamical matter degrees of freedom. Specifically, we present bounds we obtained in [1] on the allowed number and type of matter fields within asymptotically safe quantum gravity. As a novel result, we
Pietro Donà +2 more
openalex +3 more sources
Quantum reduction to Bianchi I models in loop quantum gravity [PDF]
, 2015 We propose a quantum symmetry reduction of loop quantum gravity to Bianchi I spacetimes. To this end, we choose the diagonal metric gauge for the spatial diffeomorphism constraint at the classical level, leading to an $\mathbb{R}_{\text{Bohr}}$ gauge ...
Norbert Bodendorfer
openalex +3 more sources
Solvable models of quantum black holes: a review on Jackiw–Teitelboim gravity [PDF]
Living Reviews in Relativity, 2022 We review recent developments in Jackiw–Teitelboim gravity. This is a simple solvable model of quantum gravity in two dimensions (that arises e.g. from the s-wave sector of higher dimensional gravity systems with spherical symmetry).
T. Mertens, G. Turiaci
semanticscholar +1 more source
Renormalization Group Approach to the Continuum Limit of Matrix Models of Quantum Gravity With Preferred Foliation [PDF]
Frontiers of Physics, 2020 This contribution is not intended as a review but, by suggestion of the editors, as a glimpse ahead into the realm of dually weighted tensor models for quantum gravity.
A. Castro, Tim A. Koslowski
semanticscholar +1 more source