Results 21 to 30 of about 47,494 (299)
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.
Baez, John C. +3 more
openaire +10 more sources
The Holst spin foam model via cubulations
New Journal of Physics, 2012 Spin foam models are an attempt at a covariant or path integral formulation of canonical loop quantum gravity. The construction of such models usually relies on the Plebanski formulation of general relativity as a constrained BF theory and is based on ...
Aristide Baratin +2 more
doaj +4 more sources
Spin Foam Models from the Tetrad Integration [PDF]
, 2006 We describe a class of spin foam models of four-dimensional quantum gravity which is based on the integration of the tetrad one-forms in the path integral for the Palatini action of General Relativity.
Aleksandar Miković
core +9 more sources
Enhancing Tennis Practice: Sensor Fusion and Pose Estimation with a Smart Tennis Ball [PDF]
SensorsThis article demonstrates the integration of sensor fusion for pose estimation and data collection in tennis balls, aiming to create a smaller, less intrusive form factor for use in progressive learning during tennis practice.
Yu Kit Foo, Xi Li, Rami Ghannam
doaj +2 more sources
4-dimensional spin-foam model with quantum Lorentz group [PDF]
, 2011 We study the quantum group deformation of the Lorentzian EPRL spin-foam model. The construction uses the harmonic analysis on the quantum Lorentz group.
Muxin Han
openalex +5 more sources
Spin Foam Perturbation Theory [PDF]
, 1999 We study perturbation theory for spin foam models on triangulated manifolds. Starting with any model of this sort, we consider an arbitrary perturbation of the vertex amplitudes, and write the evolution operators of the perturbed model as convergent power series in the coupling constant governing the perturbation.
Baez, John C.
openaire +5 more sources
A finiteness bound for the EPRL/FK spin foam model [PDF]
, 2013 We show that the EPRL/FK spin foam model of quantum gravity has an absolutely convergent partition function if the vertex amplitude is divided by an appropriate power $p$ of the product of dimensions of the vertex spins.
Aleksandar Mikovic +3 more
openalex +3 more sources
Toward a spin foam model description of black hole entropy [PDF]
, 2008 We propose a way to describe the origin of black hole entropy in the spin foam models of quantum gravity. This stimulates a new way to study the relation of spin foam models and loop quantum gravity.Comment: 5 pages, 1 ...
J. Manuel García-Islas +1 more
openalex +3 more sources
How-to Compute EPRL Spin Foam Amplitudes
Universe, 2022 Spin foam theory is a concrete framework for quantum gravity where numerical calculations of transition amplitudes are possible. Recently, the field became very active, but the entry barrier is steep, mainly because of its unusual language and notions ...
Pietro Donà, Pietropaolo Frisoni
doaj +1 more source
Spin foams without spins [PDF]
Classical and Quantum Gravity, 2016 21 pages, 2 ...
Hnybida, J.T., Hnybida, J.T.
openaire +4 more sources