My guess on dark matter

The galaxies the scientist looks at are cooling with long wave emissions unobservable to him. The phase gradient in these galaxies is quantized, and it is not all a smooth gravity gradient. Gravity likely more dense has greater curvature, but that is because an outer layer of quantization is compressing gravity.

The cooling emission are multimodel because they travel out, through quantized phase gradient levels. The short modes requantized back into matter, only the longest wavelengths escaping. So the scientist sees matter recirculating many time and thinks there is greater luminosity per matter than there really is.

We would see the same phenomena on Quasars, with much higher energy. The wave emission if very high energy and very multimodal. The matter dropping back into the hole is just requantized short mode waves, but some of in on a scale of galactic size. The quasar is just doing mini big bangs.

In this model the megnertron, for example, is only a couple of orders larger in apparent mass than an electron, but a couple of orders longer in wave length. Being mostly sparse, with high kinetic energy, their phase polarization is extreme, the long lobe field tightly looped and the short lobe field mostly straight.  They would be orbiting hundreds of  thousands of kilometers away from the center surface of compaction.

Around galaxies, far out in the perimeter would be a quant level I call the galactitron, very sparse, wavelength of galactical scale. But they would be crowding the gravitrons, being less sparse, the gravition field has a higher phase gradient, more curvature.

It is all about the relative packing density between quantization levels.  it is hard to judge unless one has a good approximation of the standard model for that region of space.