SO dark matter is absolutely necessary if GR is an accurate theory.
Sorry, I missed this reply. FYI, I'll skip the irrelevant stuff and cut to the chase:
Yes I would say that some form of "matter" is necessary to explain the lensing data. That does not mean it is made of an exotic type of matter.
I understand them a lot better than you do. And QED is certainly not primitive. Its probably the most precisely tested theory in the history of physics. (Have I mentioned that before?)
I won't debate the state of particle physics technologies of science with you, since even I find them to be "advanced", but how exactly do you define a level of space technology that is incapable of picking out individual stars in distant galaxies if not "primitive"?
We note conclusively what its not made of.
I don't believe you can accurately do that. There is dust in distant galaxies that blocks light from distant objects. We aren't even sure how much dust is out there in space or how much light is absorbed by that dust. You're taking "oversimplified models" and trying to apply them to everything you see in space. I see no evidence that this method you've come up with comes anywhere near the correct amount of mass in a galaxy and therefore it's time to come up with a better galaxy mass estimation technique.
The Standard model comes up short in several areas (stick "the hierarchy problem" in your favourite search engine). The simplest extension to solve these shortcomings is by invoking supersymmetry. This leads to new particles. In many (including the simplest one) supersymmetric standard models the lightest boson superpartner is stable and uncharged meaning it only interacts weakly.
Great. Demonstrate these nifty things in a lab, demonstrate their *actual physical properties* and then I'll be happy to let you point at the sky and claim SUSY stuff did it. Until I can see these so called "properties" work on real things in a real lab, in real controlled experiments, I really have no evidence they exist. The fact that standard particle physics theory has "unanswered questions" does not mean SUSY particles get to be instantly stuffed into those gaps.
These properties (which are deduced exclusively from the copious data from particle physics experiments
SUSY particles did not show up in such experiments.
and from invoking supersymmetry) happen to agree with what we can deduce about dark matter properties from observation.
You mean you can't account for distant mass, but you could make a giant leap of faith and stuff the gaps of our ignorance of space with such particles, is that it?
Now it could be that this is a complete coincidence.
I don't know. I haven't seen any SUSY particle show up in a lab. I've never seen any actual 'properties' demonstrated in real life. I simply have to have "faith" in what you "think" they will probably do based on what we have never seen in a real experiment?
This is a distinct possibility. Or SUSY could provide an answer which kills 2 (more like 3 or 4 actually) birds with one stone.
In the sense that it is possible that collider experiments might one day demonstrate such things do exist, sure it's a 'statistical probability' even based upon pure empirical physics. On the other hand, it could just be that you're letting your "faith in the unseen" get the better of you.
Alternatively it could be that dark matter is largely comprised of electrons and physics most precisely tested theory of all time happens to be completely totally and utterly wrong.
I know which horse I won't be backing.
I know something heats those coronal loops to millions of degrees and it sure as hell isn't "dark energy" or "dark matter". If you can't account for even those electrons, what faith should I have that you can find electrons in distant objects outside of our solar system?
Correction: Mass model estimates made independently and using completely different techniques are in excellent agreement.
All the measurementsl agree that there is more mass in a galaxy than your galaxy mass estimates come up with. Don't you think it's time to toss your galaxy mass estimates out the window?
The idea that they could all be completely wrong and yet somehow give exactly the same answer I have ruled out because it would be a coincidence of absolutely astonishingly extreme proportions.
The idea you can't distinguish between 'missing mass' and "non baryonic matter" is simply astonishing to me as well. The only thing that these measurements demonstrate is that your galaxy mass estimates of the amount of normal mass in a galaxy aren't worth the paper they are printed on. Period.