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Some comments about the metrics.
All the elements of the group are built from the elements of the complete Lorentz group, which obey :
(412)
with
(413)
This last matrix is linked to the metric :
(414)
...So that the two folds have same signature. If they are described as Minkowski space times, their metrics are identical. But their arrows of time are opposite.
If one wants to describe the two folds, the two universes, one has to choose his own arrow of time and space orientation.
...It is clear that the duality matter-anti-matter holds in both folds. If we call the second fold "twin fold" (A. Sakharov) or "shadow fold" (Green, Schwarz and Salam) or "ghost fold" (the author's choice), the arrow of time in this second fold is opposite (T-symmetry), as predicted by A. Sakharov, and space structures are enantiomorphic (P-symmetry).
...In the second fold the matter is CPT-symmetric with respect to ours. Whence, in that fold, a proton owns a negative charge and an electron a positive charge.
...Conversely, an anti-electron of that fold, PT-symmetric with respect to ours, owns a negative charge, whence an antiproton of the second fold has a positive charge.
...To sum up, the second fold is CPT symmetric with respect to ours. As suggested by Andrei Sakharov, we can expect that the violation of the parity principle could be reversed in that fold. ..If the absence of anti-matter, in our fold, is a direct consequence of the violation of the parity principle, it is possible that such dissymmetry would be reversed in the other fold.
**
Interacting folds.**
...All our work in astrophysics and cosmology ( see Geometrical Physics A ) comes from a system of two coupled field equations :
(10) **S *= c ( T - T )
(11) *S *** = c ( T - T )
...The two minus signs were introduced as an a priori hypothesis. At the end of this work, based on group theory, the explanation arises. The two folds *must *have opposite arrows of time and *must *be enantiomorphic in order to fit constraints coming from the group structure.
...So that the other matter, located in the other fold, for an observer located in the first, behaves as if it own a negative mass, which comes from the coadjoint action and the T-symmetry.
**Conclusion **:
...The part of the site, called Geometrical Physics B, devoted to group theory, fits the first one, devoted to astrophysics and theoretical cosmology. Group theory brings the starting point of the research.
...Geometrization of elementary particles requires a multiple extension of the complete Poincaré's group. Antimatter is geometrized. CPT-symmetrical of a matter particle cannot be longer identified to normal matter, due to its negative mass and energy, like PT-symmetrical of a matter particle cannot be identified to Dirac's anti-matter, for the same reason. Existence of negative energy species (CPT and PT-symmetrical ) requires a two-folds geometry, in which the duality matter-antimatter holds. Matter of this ghost fold is simply CPT-symmetrical and anti-matter PT-symmetrical of a normal matter particles.