Thanks.
Yet that "non-radiation condition" applies to every atom, molecule, and ion (except those fully ionized), right?
So, by this logic, everything except bare nuclei is CDM!
My hilite.This is a good explanation of the current state of knowledge of CDM. If you simply add in the non-radiation condition as the reason for CDM not feeling the effects of the EM force, then you have exactly the hydrino.JeanTate said:It's admirable that you, markie, try to read astro-preprints on arXiv.
It's rather less admirable that you don't take the time to understand the topic.
I'll take time to explain, in simple terms, what "dark matter" is, to an astrophysicist (etc). So I can quote this post in future when (not if) similar glaring misunderstandings arise. Note: this is quite simplified; if you would like more (technical) detail, please ask.
From a wide range of astronomical observations, the existence of CDM (cold dark matter), and its abundance, is a consistent conclusion. The observations do not say anything about whether CDM is a particle (or particles), or a sign of a need for a different theory of gravity, or ... or some combination thereof.
CDM is "cold" meaning that, wrt local reference frames, it moves slowly (i.e. not at relativistic speeds).
CDM is "dark" meaning that it does not emit (or absorb) electromagnetic radiation. If CDM is a particle (or particles, etc), that means its electromagnetic cross-section is very small, if not zero. Another way of saying the same thing: CDM does not "feel" the electromagnetic (EM) force. There's a lot of speculation on the size of the weak cross-section, or the strong cross-section (assuming it's a particle). Also whether a CDM particle can decay, and whether CDM particle collisions could lead to annihilation. In some speculative models, such decays or annihilations would produce an EM signature. So far, no such signatures have been reliably, independently, reported in the literature.
Neutrinos are one kind of DM - they interact with other matter via the weak force only. However, the neutrinos we know about cannot be an astrophysicist's CDM, because their signature in the CMB (cosmic microwave background) is different (and observation matches theory very well). CDM could be a heavy "sterile" neutrino, one that interacts via gravity only.
Lots of people with "alternative" views have proposed lots of different, baryonic, forms of CDM. A popular one is hydrogen gas, H2 ... but nearly always those proposing it don't know enough astronomy to realise that this is wildly inconsistent with the relevant observations. Similarly, rogue planets, iron cannon balls, and many more are likewise wildly inconsistent with the relevant observations. Perhaps the most interesting alternative is PBHs, primordial black holes; whether these are "baryonic" or not is, well, something for a good discussion! Unfortunately, I think all but perhaps a very narrow mass range of PBHs have been shown to be inconsistent with the relevant observations.
Hydrinos, and dihydrino gas, if they exist, are undoubtedly baryonic!
And, per markie et al.'s previous posts, they are not dark, by any stretch of anyone's imagination (including Mills').
So a very good question is: "have astronomers found any EM signatures of hydrinos or dihydrino gas?" No guesses as to what the answer is (pace markie)!
There are hundreds, if not thousands, of papers reporting possible electromagnetic signatures of CDM. This one is, per the author, "old, before peer review" (never a good sign). It has already many cites, and skimming these, it seems the author's ideas have been challenged. Just like many/most similar papers.
Yet that "non-radiation condition" applies to every atom, molecule, and ion (except those fully ionized), right?
So, by this logic, everything except bare nuclei is CDM!

