Results 1 to 10 of about 173,760 (383)
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 ...
Aleksandar Miković
semanticscholar +7 more sources
Quantum exponentials for the modular double and applications in gravity models [PDF]
Journal of High Energy Physics, 2023 In this note, we propose a decomposition of the quantum matrix group SL q + $$ {\textrm{SL}}_q^{+} $$ (2, ℝ) as (deformed) exponentiation of the quantum algebra generators of Faddeev’s modular double of U q ( sl $$ \mathfrak{sl} $$ (2, ℝ)).
Thomas G. Mertens
doaj +2 more sources
From quantum groups to Liouville and dilaton quantum gravity [PDF]
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
doaj +2 more sources
Quantum gravity and the standard model [PDF]
Classical and Quantum Gravity, 2007 12 pages, 21 figures, improved presentation, results ...
Sundance Bilson-Thompson +2 more
openalex +5 more sources
Testing A (Stringy) Model of Quantum Gravity [PDF]
, 2000 I discuss a specific model of space-time foam, inspired by the modern non-perturbative approach to string theory (D-branes). The model views our world as a three brane, intersecting with D-particles that represent stringy quantum gravity effects, which can be real or virtual.
Nick E. Mavromatos
openalex +5 more sources
Clocks and dynamics in quantum models of gravity [PDF]
Classical and Quantum Gravity, 2016 We investigate how the quantum dynamics of gravitational models depends on the internal clock employed in quantisation. Our previous result on the quantum Friedmann–Lemaitre model (Małkiewicz 2015 What is dynamics in quantum gravity?
P. Małkiewicz
semanticscholar +7 more sources
State sum models for quantum gravity [PDF]
, 2000 amslatex, 7 pages, ICMP conference ...
John W. Barrett
openalex +5 more sources
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 ...
M. Bojowald
semanticscholar +6 more sources
Diffeomorphism symmetry in quantum gravity models [PDF]
Advanced Science Letters, 2008 We review and discuss the role of diffeomorphism symmetry in quantum gravity models. Such models often involve a discretization of the space-time manifold as a regularization method. Generically this leads to a breaking of the symmetries to approximate ones, however there are incidences in which the symmetries are exactly preserved.
Bianca Dittrich
openalex +5 more sources
Analogue model for quantum gravity phenomenology [PDF]
Journal of Physics A: Mathematical and General, 2006 So called "analogue models" use condensed matter systems (typically hydrodynamic) to set up an "effective metric" and to model curved-space quantum field theory in a physical system where all the microscopic degrees of freedom are well understood. Known analogue models typically lead to massless minimally coupled scalar fields.
Silke Weinfurtner +2 more
openalex +5 more sources