You're confusing antimatter with dark matter.
It seems I had my Antimatter confused with mah Dark matter.
Antimatter: https://en.wikipedia.org/wiki/Antimatter
Dark matter: https://en.wikipedia.org/wiki/Dark_matter
Antimass:
I and the Internet have never heard of antimass.
Negative mass: https://en.wikipedia.org/wiki/Negative_mass
Dark energy: https://en.wikipedia.org/wiki/Dark_energy
Dark fluid: https://en.wikipedia.org/wiki/Dark_fluid :
> Dark fluid goes beyond dark matter and dark energy in that it predicts a continuous range of attractive and repulsive qualities under various matter density cases. Indeed, special cases of various other gravitational theories are reproduced by dark fluid, e.g. inflation, quintessence, k-essence, f(R), Generalized Einstein-Aether f(K), MOND, TeVeS, BSTV, etc. Dark fluid theory also suggests new models, such as a certain f(K+R) model that suggests interesting corrections to MOND that depend on redshift and density
FWIU this Superfluid Quantum Gravity rejects dark matter and/or negative mass in favor of supervaucuous supervacuum, but I don't think it attempts to predict other phases and interactions like Dark fluid theory?
From "Show HN: Physically accurate black hole simulation using your iPhone camera" https://news.ycombinator.com/item?id=42191692 :
> Ctrl-F Fedi , Bernoulli, Gross-Pitaevskii:
>> "Gravity as a fluid dynamic phenomenon in a superfluid quantum space. Fluid quantum gravity and relativity." (2015) https://hal.science/hal-01248015/
There's a newer paper on it.
Alternatives to general relativity > Testing of alternatives to general relativity: https://en.wikipedia.org/wiki/Alternatives_to_general_relati...
The new Sagittarius* black hole image with phase might help with discarding models unsupported by evidence. Are those knots or braids or fields around a vortical superfluidic attractor system? There doesn't at all appear to be a hard boundary Schwarzschild radius.
But that's about not dark matter not antimatter.