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the WIMP dark matter particle can be a heavy Dirac Fermion and such have Spin 1
If there is WIMP dark matter, it must be weaker than the weak interaction permits to comprise 100% of the dark matter. Additionally, the LHC should not detectably produce it.
Theorists can always tweak their models, and have done so many times, pushing the anticipated cross-section down and down as null result after null result rolls in. That's the worst kind of science you can do, however: simply shifting the goalposts for no physical reason other than your experimental constraints have become more severe. There is no longer any motivation, other than preferring a conclusion that the data rules out, in doing so.
The 'WIMP Miracle' Hope For Dark Matter Is Dead
doesn't for example touch on the low mass region and high mass, which again, is still open for WIMPs.
The main theoretical characteristics of a WIMP are:
• Interactions only through the weak nuclear force and gravity, or possibly other interactions with cross-sections no higher than the weak scale;
• Large mass compared to standard particles (WIMPs with sub-GeV masses may be considered to be light dark matter).
Weakly interacting massive particles
The ABC Preon Model involves a significant philosophical departure from modern advances in high energy physics theory, in that it focuses on entities that are proposed to really exist. This is in contrast with the underpinnings of the standard model which tend to be advanced, abstract and sophisticated mathematical constructs such as a Lagrangian or a Symplectic group. While this departure likely makes it easier for lay people to understand the ABC Preon Model, ironically it makes it harder for those expert in the standard model to grasp it. In the standard model, any discussions of quarks as real physical entities must be heavily nuanced, since the essence of the standard model lies in its underlying equations and not in mental pictures of actual physical entities. The mental pictures of quarks, leptons and Feynman diagrams are really more instructional tools than the basics of the theory. In contrast, for the ABC Preon Model, the essence of the theory is the existence of proposed simple objects that are postulated to exist, which is a style of thinking that has not been popular in high energy physics for several decades.
There is substantial agreement in the experimental record with the predictions of the ABC Preon Model. The ABC Preon Model also provides a very simple basis for all known matter. Additionally, there are many predictions of the ABC Preon Model that have yet to be verified experimentally.
originally posted by: ErosA433
What it shows is that if dark matter does experience this difference, the two target materials, (Xenon and Argon) are far more complimentary than what the community usually discusses. Typically the Xenon experiments continuously boast about how Xenon is the best and no one should use anything else. But the two target nuclei are quite different in that the Xenon has an excess of neutrons compared to that of Argon, so the difference in mass alone becomes less important.
originally posted by: Phantom423
Great. Can we include dark energy in this thread or is it exclusively dark matter? Thanks.
originally posted by: ErosA433
a reply to: Phantom423
The two things are quite different, if there are no other questions, sure, i guess we could discuss dark energy, though the search for Dark Matter and the nature of Dark Energy are two quite different topics.
Dark energy appears to be devouring dark matter and slowing the expansion of the cosmos, a new study suggests...
"This is a hint — not a solid result yet — that should stimulate further observational studies," Medvedev said. "It may happen to be real, but it may well go away."
‘Isn’t it a shame that with the tremendous amount of work you have done you haven’t been able to get any results?’ Edison turned on me like a flash, and with a smile replied: ‘Results! Why, man, I have gotten a lot of results! I know several thousand things that won’t work.’