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ensabah6
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I'm looking at this thread, https://www.physicsforums.com/showthread.php?t=403472
Dark Matter, On the Ropes?
If there is no dark matter, could the neutralino of MSSM, SUSY and string theory, or the axion of GUT's exist? IF there is no dark matter, doesn't this imply there are no neutralinos or other SUSY-partners, falsifying MSSM, SUSY and MSSM, and possibly higher dimensional kaluza-klein tower modes? If there is no dark matter, does this imply only SM particles exist (i.e only SM particles can be experimentally detected, particles that cannot be detected by any experiment could conceivably exist in the equally undetectable multiverse)?
Dark matter would not prove MSSM since they could be say particles of a yet unknown theory, or perhaps microblack holes are stable, or geons, but no dark matter at all wouldn't that falsify string/MSSM/SUSY/GUT?
Dark Matter, On the Ropes?
Saul said:Computer simulations of galaxy formation with Dark Matter do not match how galaxies are observed to form and do not match the observed properties of galaxies.
The simulations for example have half the observed angular momentum as compared to observations of spiral galaxies and the galaxies that form in simulation are significantly smaller than observed. The problem is dark matter thermalizes the motion of the gas clouds which causes them to clump earlier before forming large galaxies and reducing the angular momentum of the resultant galaxy. In addition the thermalization causes in the simulations a larger galaxy bulge than is observed.
A third problem is how the angular momentum (rotational velocity) changes as one approaches the center of the simulated galaxy as compared to observational data. The computer simulations show dark matter should clump at the galaxy's center which should reduce the total angular momentum (rotational velocity) at the center of the galaxy. This is not observed. The spiral galaxy continues to rotate as one moves to the center of the spiral. This clumping of dark matter in the center of galaxy's also breaks up the bars in spiral galaxy in simulations, which makes it difficult to even form bar, which does not make sense as the observational data indicates spiral bars form and have a long lifetime.
The dark matter detection experiments have not been able to detect dark matter. The point of the dark matter detection is to determine if dark matter does or does not exist.
It is telling that there multiple very fundamental observations that dark matter cannot explain and no one has been able to detect dark matter.
If there is no dark matter, could the neutralino of MSSM, SUSY and string theory, or the axion of GUT's exist? IF there is no dark matter, doesn't this imply there are no neutralinos or other SUSY-partners, falsifying MSSM, SUSY and MSSM, and possibly higher dimensional kaluza-klein tower modes? If there is no dark matter, does this imply only SM particles exist (i.e only SM particles can be experimentally detected, particles that cannot be detected by any experiment could conceivably exist in the equally undetectable multiverse)?
Dark matter would not prove MSSM since they could be say particles of a yet unknown theory, or perhaps microblack holes are stable, or geons, but no dark matter at all wouldn't that falsify string/MSSM/SUSY/GUT?