a203 A cosmological model: The twin big bang. (p.3)
Joint gravitational instabilities.
...This is the extension of the Jeans' theory to two interacting populations. See the paper:
J.P. Petit and P. Midy: Ghost matter, astrophysics. 4: Joint gravitational instabilities. Geometrical Physics A, 7, 1998. ...
...When a clump forms in a fold, a conjugated lacuna forms in the corresponding adjacent region of the second fold.
(153)
...In figure (153), top: the clump forms in fold F and the lacuna in fold F*. Below: reversed situation.
...In figure (154) we use the model of a checkerboard:
(154)
...Recall that matter-made observers cannot see ghost matter structures. On figures (155) and (155') the inverse situation.
(155)
...On purely geometrical grounds, photons cannot reach a ghost-matter-made observer, and ghost photons cannot reach a matter-made observer.
...On figure (156) a "3D checkerboard".
(156)
...Following, a model illustrating the joint gravitational instabilities mechanism. Imagine a tank, made of plexiglass, for example, filled with water. In the middle of the tank, a horizontal and flexible sheet, which is the boundary between two liquid domains: upper and lower. On top, an initially uniform distribution of heavy balls (black).
...Below, an initially uniform distribution of ping-pong balls. The two elements are supposed to have random horizontal "thermal velocities". Then we can assume that, at random, some heavy balls form a clump, somewhere on the sheet. They form a depression in which they tend to attract their neighbors. But, as shown on figure (156bis), ping-pong balls participate in the process. They are repelled by the cluster and tend to form a potential barrier around it. They reinforce the confinement effect.