Results 21 to 30 of about 1,243 (181)

Quantum Cauchy surfaces in canonical quantum gravity [PDF]

Classical and Quantum Gravity, 2016
For a Dirac theory of quantum gravity obtained from the refined algebraic quantization procedure, we propose a quantum notion of Cauchy surfaces. In such a theory, there is a kernel projector for the quantized scalar and momentum constraints, which maps the kinematic Hilbert space $\mathbb K$ into the physical Hilbert space $\mathbb H$.
openaire   +2 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   +4 more sources

Three-dimensional canonical quantum gravity [PDF]

Classical and Quantum Gravity, 1995
General aspects of vielbein representation, ADM formulation and canonical quantization of gravity are reviewed using pure gravity in three dimensions as a toy model. The classical part focusses on the role of observers in general relativity, which will later be identified with quantum observers.
openaire   +3 more sources

Which Quantum Theory Must be Reconciled with Gravity? (And What Does it Mean for Black Holes?)

Universe, 2016
We consider the nature of quantum properties in non-relativistic quantum mechanics (QM) and relativistic quantum field theories, and examine the connection between formal quantization schemes and intuitive notions of wave-particle duality.
Matthew J. Lake
doaj   +1 more source

Modifications to gravitational wave equation from canonical quantum gravity

European Physical Journal C: Particles and Fields, 2020
It is expected that the quantum nature of spacetime leaves its imprint in all semiclassical gravitational systems, at least in certain regimes, including gravitational waves.
Andrea Dapor, Klaus Liegener
doaj   +1 more source

Cauchy slice holography: a new AdS/CFT dictionary

Journal of High Energy Physics, 2023
We investigate a new approach to holography in asymptotically AdS spacetimes, in which time rather than space is the emergent dimension. By making a sufficiently large T 2-deformation of a Euclidean CFT, we define a holographic theory that lives on ...
Goncalo Araujo-Regado, Rifath Khan, Aron C. Wall   +2 more
doaj   +1 more source

Inequivalent Canonical Quantizations in Quantum Gravity [PDF]

Progress of Theoretical Physics, 1984
Summary: It is explicitly shown in quantum gravity that given a Lagrangian density up to a total divergence, the equal-time commutators between field operators can depend on the choice of canonical variables. It is shown, however, that canonical quantizations which do not reproduce the equal-time commutators of the manifestly covariant canonical ...
openaire   +1 more source

Constraining the loop quantum gravity parameter space from phenomenology

Physics Letters B, 2018
Development of quantum gravity theories rarely takes inputs from experimental physics. In this letter, we take a small step towards correcting this by establishing a paradigm for incorporating putative quantum corrections, arising from canonical quantum ...
Suddhasattwa Brahma, Michele Ronco
doaj   +1 more source

Quantum Uncertainties of Static Spherically Symmetric Spacetimes

Universe
We present a canonical quantization framework for static spherically symmetric spacetimes described by the Einstein–Hilbert action with a cosmological constant.
Benjamin Koch, Ali Riahinia
doaj   +1 more source

No fermion doubling in quantum geometry

Physics Letters B, 2015
In loop quantum gravity the discrete nature of quantum geometry acts as a natural regulator for matter theories. Studies of quantum field theory in quantum space–times in spherical symmetry in the canonical approach have shown that the main effect of the
Rodolfo Gambini, Jorge Pullin
doaj   +1 more source