Results 11 to 20 of about 2,706,843 (321)
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
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Black-hole models in loop quantum gravity [PDF]
Universe, 2020 Dynamical black-hole scenarios have been developed in loop quantum gravity in various ways, combining results from mini and midisuperspace models. In the past, the underlying geometry of space-time has often been expressed in terms of line elements with metric components that differ from the classical solutions of general relativity, motivated by ...
Martin Bojowald
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Quantum Machian time in toy models of gravity [PDF]
Classical and Quantum Gravity, 2009 27 pages, references added, typos fixed, additional comments added to abs/intro/concl, journal ref ...
Sean Gryb
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An integrable model of quantum gravity [PDF]
Physics Letters B, 1995 12 ...
Hermann Nicolai +2 more
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A model of quantum gravity with emergent spacetime [PDF]
Journal of High Energy Physics, 2020 Abstract We construct a model of quantum gravity in which dimension, topology and geometry of spacetime are dynamical. The microscopic degree of freedom is a real rectangular matrix whose rows label internal flavours, and columns label spatial sites. In the limit that the size of the matrix is large, the sites can collectively form
Sung-Sik Lee, Sung-Sik Lee
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Journal of High Energy Physics, 2022 Combinatorial quantum gravity is governed by a discrete Einstein-Hilbert action formulated on an ensemble of random graphs. There is strong evidence for a second-order quantum phase transition separating a random phase at strong coupling from an ordered,
C. A. Trugenberger
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Lorentzian quantum gravity via Pachner moves: one-loop evaluation
Journal of High Energy Physics, 2023 Lorentzian quantum gravity is believed to cure the pathologies encountered in Euclidean quantum gravity, such as the conformal factor problem. We show that this is the case for the Lorentzian Regge path integral expanded around a flat background.
Johanna N. Borissova, Bianca Dittrich
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Solvable model for quantum gravity? [PDF]
Classical and Quantum Gravity, 2013 We study a type of geometric theory with a non-dynamical one-form field. Its dynamical variables are an $su(2)$ gauge field and a triad of $su(2)$ valued one-forms. Hamiltonian decomposition reveals that the theory has a true Hamiltonian, together with spatial diffeomorphism and Gauss law constraints, which generate the only local symmetries.
Viqar Husain, Jack Gegenberg
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Effective de Sitter space, quantum behaviour and large-scale spectral dimension (3+1)
Journal of High Energy Physics, 2023 De Sitter space-time, essentially our own universe, is plagued by problems at the quantum level. Here we propose that Lorentzian de Sitter space-time is not fundamental but constitutes only an effective description of a more fundamental quantum gravity ...
C. A. Trugenberger
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From quantum groups to Liouville and dilaton quantum gravity
Journal of High Energy Physics, 2022 We investigate the underlying quantum group symmetry of 2d Liouville and dilaton gravity models, both consolidating known results and extending them to the cases with N $$ \mathcal{N} $$ = 1 supersymmetry.
Yale Fan, Thomas G. Mertens
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