Fictitious "dark matter" should not be detectable as Standard Model point particles because the extra gravity actually comes from outside our Big Bang, according to my BBN (Big Bang Neighbor) Hypothesis. Fictitious dark matter should instead appear as a smeared out blob, just like the posited axions in the paper of Alfred Amruth et al (Nature; 20 April 2023). I, however, don't have to invent a new particle to explain anything.
https://skyandtelescope.org/astronomy-news/distorted-galaxy-hints-at-the-nature-of-dark-matter/
Proving the Relativistic Energy-Momentum relation, the hard way and the easier way.
This adds the proof for the relativistic mass effects from motion, proving that gravity causes it.
Two reference frames in motions are not symmetrical. A system at rest on the surface of a planet moves faster in time than a moving system. This is not the case using just Special Relativity. This is proven just using the gravitational metric field in General Relativity.