This model has been in testing for 3 years and it passed all tests so far.
It already past sevral test and it solves a lot of problems that require dark energy or matter. And problems introduced by the James Webb telescope. It also confirmed cosmic chronometer findings on the expansion history.
It does not disprove models, it just shows that dark matter and energy are not needed and explains why we can’t find them.
No, it’s still basically a placeholder. Dark matter is basically mass we can’t detect in any way, but the invisible extra mass is required to make our models match up with reality
I think that expansion is more related to dark energy, which is a different placeholder
But we really don’t understand the mechanisms for expansion in the first place… If the universe is twice as old that will certainly change the model. There’s also a growing theory that the universe exists within a black hole, and the spin of that black hole might explain several different strange properties of the universe