[nickersonm]

Are you thinking of Timescape Cosmology [0]? I think it's a great explanation for dark energy that should be further explored. A summary is that due to the large difference in gravitational gradients between in-a-galaxy and between-galaxies, it appears that intergalactic space is expanding, but in reality it's just progressing at a faster rate of time due to general relativity, thus appearing to inflate from our perspective.

Typical cosmological models assume homogeneity, which IMO is a poor assumption with the lumpy universe we live in. I'm a fan of more exactly applying known models before inventing new terms!

[0] http://www2.phys.canterbury.ac.nz/~dlw24/universe/

[floxy]

I'm assuming that the OP was referring to gravitomagnetism with general relativity that was making the rounds a while back:

https://link.springer.com/article/10.1140/epjc/s10052-021-08...

...not to be confused with the hypothesis that regular magnetism is the source of the unexplained measurements of the galactic rotation curves:

https://www.nature.com/articles/360652a0

[bjornsing]

It was the gravitomagnetism one, yes.