is it possible to have a dark std model (ie image of the std model) linked to the std model only through the Higgs? That would allow dark matter condensation, dark galaxies, stars, planets and biology. Is there any astronomical evidence for (or search for) large condensed dark matter structures though gravitational lensing? "distant Light bending around nothing?" all fanciful, but fun to think about.
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$\begingroup$ That is, of course entirely possible. The problem with such considerations is that they are overkill, way to specific to be worth studying. Scientists are trying hard to find something, anything that could be legitimately used to describe the observed effects of dark matter and start with the most basic models. Proposing a complete dark sector would be like proposing the existence of alien life, but then being very specific on their anatomy and political systems without any hard facts or proof of existence at all. $\endgroup$– CreamCommented Dec 10, 2020 at 9:52
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$\begingroup$ Techniquark: hold my beer. $\endgroup$– MadMaxCommented Dec 10, 2020 at 23:23
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$\begingroup$ not possible if it is a dark brew $\endgroup$– RobbydcmCommented Dec 12, 2020 at 2:23
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Yes. Actually, it is also possible to have such a Dark Standard Model that is linked to the Standard Model only through gravity.
Original theories for the nature of dark matter assumed all of the dark matter to be made of a single particle. WIMPs and Axions are the two prototype examples. Since these have not yet been found, it is perhaps no surprise that also more complex "Dark Sectors" are being looked into. A simple extension beyond a single dark matter particle for example includes a fifth force that lives in that dark sector. "Dark Photons" are one particular and currently rather popular model of that class. The problem with all these more complex models is though that the experimental constraints are minimal or non-existent, and one enters philosophical thin ice when developing such complex models that have no foundation in any experimental data.
Entirely dark galaxies are unlikely. The science of structure formation in combination with extensive gravitational lensing studies and analysis of the cosmic microwave background rule out the hypothesis that most of dark matter would be in clumps exceeding a few solar masses.
Concerning lower-mass clumps, there are also significant constraints, again from gravitational lensing. The corresponding observations typically are referred to "MACHO searches", for MAssive Compact Halo Objects. It is thus not yet ruled out completely that there could be dark stars or dark planets, but indeed it is rather unlikely, given the strong constraints from these searches.
To summarize, while it is allowed by current data that there could be dark aliens wandering around their planets, existing constraints make this quite unlikely.
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$\begingroup$ thanks for your reply. Too bad would have made a nice super symmetry (as opposed to supersymmerty), and not too much to work out as dark physics would have been the same as ours! Still we are the dark matter of the dark matter world whatever it is! Good bit of fun. $\endgroup$– RobbydcmCommented Dec 12, 2020 at 2:11
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$\begingroup$ A model that duplicates the standard model goes by the name of "Mirror Dark Matter", see e.g. arxiv.org/abs/1401.3965 $\endgroup$– rflCommented Dec 15, 2020 at 14:48