Hey @Kevin_Levites, if I remember correctly, the actual argument for irregularities in microwave background radiation is the distribution of dark matter. They performed some simulations and they discovered that the model best correlated with the observation is the dark matter.
However there are now scientists refusing the dark matter model and are pushing some new calculations, something like modified gravitational hypothesis.
I personally think that the answer is somewhere in between, I think that we don’t understand large masses well enough, and I think that we are ignoring collective effects of individual particles. We have no means to test this by inducing specific changes and measuring their effects so we can only rely upon our passive observation.
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