Hello
Dark matter is another field which is quite interesting in particle physics. However it is rather different from the neutrinos physics (because neutrino is not dark matter). Dark matter is something that we do not detect in our laboratories, the name dark matter comes from the fact that we don’t see it directly. The evidence of existence from dark matter comes from precise observation of our galaxy. This is the work of an astrophysicist, or maybe a cosmologist.
The particles in vacuum is another thing, basically what physics tells us now is that the vacuum is full of particle appearing and disappearing all the time. This is a form of energy in the vacuum. So particles in vacuum for a particle physicist would be more the translation of dark energy for a cosmologist…
I am not sure this answer your question, though, but I don’t think I will work on dark matter nor on dark energy because this is more related to cosmology.
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