I'm now at a cosmology conference: https://indico.cern.ch/event/736594/overview
One reason to go to a conference is to hear about interesting things one might have missed. For me, probably the most interesting talk was the penultimate one, an update on these publications concerning a novel dark-matter candidate:
https://arxiv.org/abs/1311.1627 http://iopscience.iop.org/article/10.1088/1742-6596/496/1/012023 https://arxiv.org/abs/1801.04206
Those papers do not show any physical evidence.
The common author in all
papers is Jarah Evslin,
working in Peking.
Dark matter halos grow by merging. This merging requires them to be attractive, but the simplest manifestation of monopole dark matter is repulsive.
Unfortunately these monopoles repel and so the charge Q > 1 halos are unstable. This may rule out our model. Then again, protons repel but..
visible matter is mostly made of protons, as the repulsion at small
distances is canceled by neutrons and at large distances is screened by electrons. The monopoles only repel at long distances. So what are the analogs of the electrons? Electrons carry the opposite charge from
protons but cannot annihilate with protons as they carry a flavor
quantum number and the lightest state for a decay product, the neutron,
is too massive for the decay to be kinematically allowed. Similarly such=
a flavor quantum number for the monopoles is an automatic consequence of=
our fermionic couplings. The masses of the various flavors of monopoles
can be adjusted by choosing the Yukawa couplings. We propose to include
light antimonopoles of a different flavor which screen the long distance=
repulsion of our monopoles. If such a screening cannot be made to work,
our proposal will be excluded.
Let's see then...
They have to first find out the "electrons" that would screen out the repulsion between those galaxy sized monopoles.
All this is interesting, yes, but it is very difficult to gauge if there=
is any connection with reality at this stage. Mathematics is an infinite=
forest, and it is very easy to lose your way in the equation undergrowth.=
Obviously too, I am in NO WAY able to follow precisely those papers, and=
can only look at the conclusions.
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