First collisions at the LHC with unprecedented Energy! (Ask a particle physisicist)

[Alex K]

It could very well be that Dark Matter is composed of several different kinds of undiscovered particles - it's not a given that the "dark sector" has a very simple structure with just one additional particle floating around. However, with the two alternatives I mentioned above, at the simplest level, just having either the one or the other would suffice.

Is it intentional that physicists produce only enough experimental data and interpretation to raise more questions and confusion?  Or is it a fortuitous accident that gives good and sufficient reason to continue funding experimental programs.

Dark matter only weakly interacts with the 'real' (anthropic bias noted here) stuff.
Is there any reason to believe that it interacts with itself with the same complex, chaotic results as does real matter?
Could there then be the sort of structure found in our universe, dark suns, dark planets, cladistic trees of evolved dark animals?
Would it coexist in the same spacetime on top of us but because of the weak interactions, we wouldn't know it?

And would it be superman bizzarro universe or the evil Captain Kirk universe?

Having the Dark matter in the form of a dark world as you propose, is a very exciting thought (I mean, how cool would that be), but unfortunately pretty firmly excluded by observations - we do after all know what the gravitational effects of the dark matter must look like, and your dark parallel world would not satisfy observations.

if dark matter would form dark suns and dark hamsters etc, and it therefore would have to have friction and interaction like our normal matter, it would first of all form disk-like shapes just like our matter, and therefore probably not explain the rotation curves of galaxies for which galaxies need to be embedded in larger clouds of dark matter. Nor would the simulations for large scale structure formation in the early universe come out right.

But, I think, more importantly, such parallel "dark" planets and stars would have been seen in gravitational lensing surveys (you would see a sudden shift in brightness when such a dark star or planet goes in front of one of our ordinary stars because the local curvature of space it induces would act like a lens amplifying the brightness of that star as seen by us).

All this makes it more likely that the Dark Matter behaves mostly like a super-dilute gas that is spread out more evenly.

Is it intentional that physicists produce only enough experimental data and interpretation to raise more questions and confusion? Or is it a fortuitous accident that gives good and sufficient reason to continue funding experimental programs.

What could you possibly mean...
But seriously, the frontier of knowledge is always confusing by definition. There is this funny idea by some old philosopher that knowledge might be like filling a sphere in the sea of all the things we do not know - the more we expand it, the larger becomes the contact area with that which we do not know.