Results 1 to 10 of about 166,290,583 (305)
Quantum exponentials for the modular double and applications in gravity models
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
Comparing Quantum Gravity Models: String Theory, Loop Quantum Gravity, and Entanglement Gravity versus SU(∞)-QGR [PDF]
Symmetry, 2022 In a previous article we proposed a new model for quantum gravity (QGR) and cosmology, dubbed SU(∞)-QGR. One of the axioms of this model is that Hilbert spaces of the Universe and its subsystems represent the SU(∞) symmetry group. In this framework, the classical spacetime is interpreted as being the parameter space characterizing states of the SU ...
Houri Ziaeepour
exaly +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 metric components that differ from the classical solutions of general relativity, motivated by ...
Martin Bojowald
exaly +4 more sources
Inequivalence of mimetic gravity with models of loop quantum gravity
Physical Review DCertain versions of mimetic gravity have recently been claimed to present potential covariant theories of canonically modified spherically symmetric gravity, motivated by ingredients from loop quantum gravity. If such an equivalence were to hold, it would demonstrate general covariance of a large class of models considered in loop quantum gravity ...
Erick Iván Duque Gonzalez +1 more
exaly +3 more sources
An integrable model of quantum gravity [PDF]
Physics Letters B, 1995 12 ...
Korotkin, D., Nicolai, H.
openaire +6 more sources
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
doaj +1 more source
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
doaj +1 more source
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.
Gegenberg, Jack, Husain, Viqar
openaire +2 more sources
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
doaj +1 more source
Quantum gravity inspired nonlocal gravity model [PDF]
Physical Review D, 2017 We consider a nonlocal gravity model motivated by nonperturbative Quantum Gravity studies. This model, if correct, suggests the existence of strong IR relevant effects which can lead to an interesting late time cosmology. We implement the IR modification directly in the effective action.
Amendola, Luca +2 more
openaire +2 more sources