Open AccessOn the creation of spacetime volume and gravity in loop gravity
Author(s) -
Dan Shao,
Shao Liang,
Shao Chang-gui
Publication year - 2011
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.60.120401
Subject(s) - spacetime , physics , quantum gravity , spin network , group field theory , spin foam , vertex (graph theory) , quantum field theory in curved spacetime , loop quantum gravity , spacetime symmetries , semiclassical gravity , gravitational field , gravitation , spin (aerodynamics) , mathematical physics , quantum , classical mechanics , quantum mechanics , computer science , quantum dynamics , graph , quantum process , thermodynamics , theoretical computer science
Using the 4-simplex and its dual-skeleton spin networks, a quantum transition of pure spacetime is described. The change of vertex volumes between successive steps of the transition of the three-dimensional space woven by spin networks is demonstrated. At the same time, a model of quantum flate fluctuation of the four-dimensional spacetime is given. Employing the excitations created when the loops on the edges of spin network pierce sarfaces, a 2 order symmerric tensor hab is obtained in three-dimensional space. Based on the viewpoint that the spacetime is excitation and transition system, the creation and the change mechanisms of the gravitational field h are investigated.