[Smooth-Weather]

There is also Jean-Pierre Petit, who presents his Janus Cosmological Model with multiple publications in peer-review journals. It has 19 observational confirmations and various predictions.

The Janus bimetric model, for example, describes two parallel universes instead of one, with an opposite time arrow, linked together since the Big Bang and interacting only by gravitation. According to this model, the Universe would be associated with two Riemannian metrics, one with a matter of positive mass and the other with a matter of negative mass, resulting from the CPT symmetry. The two metrics have their own geodesic and are the solution of two coupled field equations.

The dark matter would be, in fact, a conglomerates of negative matter.

It's interesting, Here is a preprint resuming multiples aspects of it: https://hal.archives-ouvertes.fr/hal-03285671/document