The previous post (on Neo-Newtonian Cosmology NNC) about dark matter asks if invisible/dark matter connected to a primordial gravitational potential $\phi$ through the Laplacian differential operator $\Delta$, may not react to gravitational force $-\nabla\phi$ in the same way as visible matter, maybe not at all.
The halo of invisible/darl matter supposedly surrounding a galaxy would then contribute to gravitational force as an explanation of observed rotation, but would not itself be subject to contraction by gravitational force.
There would thus be a fundamental difference between visible and invisible/dark matter beyond visibility: Visible matter has gravitational mass (equal to inertial mass), while invisible/dark matter has zero gravitational mass thus acting as a passive contributor to gravitational potential without feedback from gravitational force.
(This is sometimes referred to as active and passive gravitational mass, with the meaning of active and passive switched from a perspective that mass is primordial.)
There would thus be fundamental difference between the galaxy and the surrounding halo depending on the nature of $\Delta\phi$ as high-density-localised visible or as low-density-distributed invisible.
The current paradigm of Big Bang + Inflation as Post-Newtonian Cosmology suffers from basic questions without answers such as: What was before Big Bang? What was driving initial very rapid Inflation?
Neo-Newtonian Cosmology offers answers to these questions, and more. Maybe it is time for Newton to come after having been replaced by Einstein during 100 years of confusion.
Cosmology is troubled by the apparent impossibility of detecting any particle nature of dark matter. The basic idea of modern fundamental physics is that of particles as some form of point-like little things which can be captured in particle accelerator detectors, but no dark matter particles have been found, not even by the giant particle detector at LHC (see human scale bottom):
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