"Broken T4 symmetry of the Poincare group --> Einstein's 1916 GR
(without torsion) seen in the nonholonomic Cartan tetrad with Bu^a as
the compensating gauge potential."
should be replaced by
Locally gauged T4 symmetry of the Poincare group --> Einstein's 1916 GR
(without torsion) seen in the nonholonomic Cartan tetrad with Bu^a as
the compensating gauge potential. The Bu^a, in turn, come from
spontaneous broken U(1) vacuum symmetry, same as in a superconductor.
However, here we deal with neutral off-mass-shell virtual
electron-positron bound pairs, not the charged on-mass-shell real
electron bound pairs.
Locally gauging a group G breaks the global symmetry down to a local
symmetry restoring the conservation law with the compensating gauge
potential AKA connection field. This is different from spontaneous
breakdown of the vacuum in which the symmetry is not restored. Preferred
frames are the result of the latter not the former. The two kinds of
symmetry breaking tango with each other in the Cosmic Dance.
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