Measuring dark matter's repulsive force

[Skolon]

I know that today science are studying matter at fundamental level using particle accelerators. I think that some of that studies were done with intention to discover some parts from dark matter mystery, but I suppose that we need bigger accelerators.

In Universe some "natural" accelerators exist, much bigger that we will can create in near future. I speak about BH accretion disks and other similar phenomena. Aren't these phenomena closely oversee with dark matter discoveries in mind? I suppose they are. But did we found something interesting from this supervises?

 

[Robert Powell]

No, it doesn't say that this matter is concentrated at the edge.

That makes most of the rest of your post rather moot.

My statement that dark matter was at the edge of a galaxy was not meant to be taken literally and is not important as related to the post. Your follow up statement that indicates this makes the rest of my post moot is very closed minded.

 

[Robert Powell]

Twofish-quant, thank you for your responses to my post and your comment on the MOND theory. I appreciate your time and your weighted thoughts.

 

[Frame Dragger]

Vanadium, this type of reply makes you unworthy to hold the title "mentor" near your name. My statement that dark matter was at the edge of a galaxy was not meant to be taken literally and is not important as related to the post. Your follow up statement that indicates this makes the rest of my post moot is very closed minded. When replying to the posts of others, try to do a better mentoring job.

Your post was borderline nonsensical, as is your explanation. You didn't mean the statement that a physical quantity was concentrated in a particular area to be taken literally... how DID you mean it to be taken? Metaphorically?! You just came at this all wrong, so don't vent your spleen at a guy who is very helpful just because he was the first of many to shoot you down. :D

 

[twofish-quant]

I know that today science are studying matter at fundamental level using particle accelerators. I think that some of that studies were done with intention to discover some parts from dark matter mystery, but I suppose that we need bigger accelerators.

The problem is that it's hard to figure out what instrument you need to find something, if you don't know exactly what you are looking for.

There are dozens of experiments that are trying to find dark matter: The basic idea is that you put a detector in some deep dark cave and look for dark matter interacting with normal matter. You might ask what happens if dark matter doesn't interact with normal matter. Well, if you don't find anything, then you know whatever dark matter is, it doesn't interact with normal matter, which narrows down the possibilities for what it might be...

http://lpsc.in2p3.fr/mayet/dm.php

In Universe some "natural" accelerators exist, much bigger that we will can create in near future. I speak about BH accretion disks and other similar phenomena.

They are bigger but they aren't hotter. The energies that you find in a black hole accretion disk really aren't larger than what we can create with things like the large hadron collider.

Aren't these phenomena closely oversee with dark matter discoveries in mind? I suppose they are. But did we found something interesting from this supervises?

Part of the problem is that it's tough to see something if you don't know exactly what you are looking for.

 

[edpell]

This is one of those "I don't make the rules of the universe, I just figure out what they are."

I think we need deeper explanations.

Also creation of energy really doesn't bother me that much. It turns out that conservation of energy results when you have a system that is time-symmetric. If you have systems that aren't time symmetric, then you don't get conservation of energy.

OK

If you rub your hands together fast enough heat gets created out of nothing. If you have enough energy in one place than matter/anti-matter pairs get created out of nothing.

Your posts are very good so this part surprises me. When you rub your hands your muscles are doing work (powered by "burning" food) so energy is transferred from one form and place to another form and place (energy is conserved). Likewise with pair creation the blob of energy precipitates out into pairs (energy is conserved).

Well just look at hubble's law. V=Hr. If the universe is infinite or even really, really big, then eventually you'll find a galaxy that's moving away from you at faster than light.

Yes and no. I understand the idea. I would counter with: it can not be observed. Things that can not be observed are dubious subjects for physics. We can observe redshifts with z=9 and can not observe redshift with z=infinity.

 

[Frame Dragger]

...
Part of the problem is that it's tough to see something if you don't know exactly what you are looking for.

That is true, and genuinely profound.