Ys. Duan et al., THE QUANTIZATION AND PRODUCTION OF THE SPACE-TIME DEFECTS IN THE EARLY UNIVERSE, International journal of modern physics A, 13(12), 1998, pp. 2001-2012
In Riemann-Cartan manifold U-4, a new topological invariant is obtaine
d by means of the torsion tenser. In order to describe the space-time
defects (which appear in the early universe due to torsion) in an inva
riant form, the new topological invariant is introduced to measure the
size of defects and it is interpreted as the dislocation flux in inte
rnal space. By the use of the so-called phi mapping method and the gau
ge potential decomposition, the dislocation flux is quantized in units
of the Planck length. The quantum numbers are determined by the Hopf
indices and the Brouwer degrees. Furthermore, the dynamic form of the
dislocations is studied by defining an identically conserved current.
Based on the implicit function theorem, the production of the defects
at the limit points is detailed.