“if general relativity is an accurate cosmological model” Then there should be something slowing down expansion. You look for it and it can’t be found anywhere. Well it must be INVISIBLE then!
This sounds oddly similar to the “evidence” used to convict people of witchcraft. There is a deep problem in modern physics. They have made an error way back, and they keep cobbling on nonsense “fixes” to make the math fit the original error.
Don’t forget, different “maths” (topology, imaginary numbers,
imaginary time) need to be invented for
the theoretical to match the actual.
Is math “scientific”? Or is it a good attempt at
explaining what we still don’t know too well?