Wednesday, 15 August 2018
Does Dark Matter Exist?
It is claimed to make up more than a quarter of the entire universe however scientists just can't find it. More and more experiments report that they had failed to find any trace of it.
Despite a brief flurry of excitement the Large Hadron Collider has so far failed to make any progress, and astronomical observations have also come up empty handed.
Astrophysicists have piled up observations that are difficult to explain with it - that is Dark Matter. It is time to ask if Dark Matter really exists.
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The idea which Milgrom came up with in 1983 was a simple model called Modified Newtonian Dynamics (MOND). It does a good job fitting the rotation curves of hundreds of observed galaxies, and in contrast to particle dark matter this model requires only one parameter as input. That parameter is an acceleration scale which determines when the gravitational pull begins to be markedly different from that predicted by Einstein’s theory of General Relativity. Based on his model, Milgrom also made some predictions which held up so far.
In a 2016 paper, McGaugh, Lelli, and Schomberg analyzed data from a set of about 150 disk galaxies. They identified the best-fitting acceleration scale for each of them and found that the distribution is clearly peaked around a mean-value:
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