The notion of dark matter was invented to make cosmology work. Science contains several other examples of substances that were invented to make the theories of the time work. Phlogiston was one, luminiferous ether was another. Both inventions hid the truth and held up progress for too long. I suspect later generations may point and laugh at dark matter as we now laugh at phlogiston.
It all starts with the red shift which is completely ascribed to the doppler effect. (I may have skipped a step or two here, but bear with me...) And then we get into some uncomfortably circular definitions concerning the brightness of distant objects and the speed at whch distant objects are receding from us. But what if the doppler effect is not the whole story. What if something else is affecting the spectrum of distant objects? Might we find perhaps that when the universe was so much younger and smaller and more dense that the speed of light was different. The photons emitted by those ancient and now-distant objects were created when the physical laws which dictated their generation and propagation were subtly different because there was a difrent value for c.
Now I am no astrophysicist, nor am I enough of a mathematician to take this notion a step further. I am certainly no Newton or Galileo so I cannot produce a frightening and elegant demonstration to prove my point. I think one would have to measure the speed of light to the nth level of precision over geologically long periods of time to establish whether it might change over that period. Either that or come up with something of Einsteinian grandeur to show that the speed of light is not constant but a variable and depended on the age of the universe.
With the prize of eternal fame and the title of being the hero that fixed 20th century cosmology, who would like to take this one on?
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