Is there plasma that doesn't radiate visible light? I think the

[Drakkith]

Ok. I just heard some theorize that dark matter is composed of plasma and wondering what kind of unconvensional particles it may contain that don't react electromagnetically... or too subtle to be detected... they reported about magnetic field that exist right in the middle of nowhere in deep outer space... and wondered if they came from the dark matter plasma..

Well, remember that like charges repel, so any "plasma" that doesn't consist of equal amounts of charges (ions and electrons) will fling itself apart.

 

[Varon]

Well, remember that like charges repel, so any "plasma" that doesn't consist of equal amounts of charges (ions and electrons) will fling itself apart.

Check this out:

http://arxiv.org/abs/0810.5126

Can you try to refute the article?

"We raise the prospect of interesting new plasma effects in dark matter dynamics, which remain to be explored. "

 

[ZapperZ]

Check this out:

http://arxiv.org/abs/0810.5126

Can you try to refute the article?

"We raise the prospect of interesting new plasma effects in dark matter dynamics, which remain to be explored. "

This is a meaningless reference. You are using something that is still a "research front" (dark matter) as "evidence".

You shouldn't be trolling such papers when you are having problems with understanding basic physics.

Zz.

 

[Varon]

This is a meaningless reference. You are using something that is still a "research front" (dark matter) as "evidence".

You shouldn't be trolling such papers when you are having problems with understanding basic physics.

Zz.

The reason I started this thread is to understand plasma better in order I can scrutinize the paper myself. So I may share the paper as well.

Anyway. What I learn here is the plasma should always have positive and negative charge. Now that part of the paper makes sense.. that dark matter can only be plasma if there is dark radiation made up of positive and negative charge too. So you guys are helpful in this realization. Thanks.

 

[ZapperZ]

The reason I started this thread is to understand plasma better in order I can scrutinize the paper myself. So I may share the paper as well.

Anyway. What I learn here is the plasma should always have positive and negative charge. Now that part of the paper makes sense.. that dark matter can only be plasma if there is dark radiation made up of positive and negative charge too. So you guys are helpful in this realization. Thanks.

And that makes very little sense, because you clearly have not understood what "dark matter" is. If it is a plasma, we would have observed it very clearly. After all, we HAVE observed plasma in other parts of the universe!

You are trying to learn physics in bits and pieces, and I've noticed this in many of your posts on here. I don't think you have a coherent understanding of the physics that you're asking about. This thread is one clear example where you're think you've understood something, when clearly, you missed the complete picture. It is very difficult to comprehend that for someone who didn't know what an "ion" is, that you're are attempting to understand papers like this.

Zz.

 

[Varon]

And that makes very little sense, because you clearly have not understood what "dark matter" is. If it is a plasma, we would have observed it very clearly. After all, we HAVE observed plasma in other parts of the universe!

You are trying to learn physics in bits and pieces, and I've noticed this in many of your posts on here. I don't think you have a coherent understanding of the physics that you're asking about. This thread is one clear example where you're think you've understood something, when clearly, you missed the complete picture. It is very difficult to comprehend that for someone who didn't know what an "ion" is, that you're are attempting to understand papers like this.

Zz.

I know what is dark matter.. we don't know what it is composed of.. whether the lightest supersymetric particles or others we don't know. The paper is just proposing it is some kind of plasma and I've been thinking about it for months on and off so may as well ask about plasma here. Btw.. i own over a hundred pop-sci science books and read all of them (mostly mathless hence I focus more on the conceptual as I'm still learning the math) .

Anyway. Here's the abstract of the paper:

"We explore the feasibility and astrophysical consequences of a new long-range U(1) gauge field
(dark electromagnetism") that couples only to dark matter, not to the Standard Model. The
dark matter consists of an equal number of positive and negative charges under the new force,
but annihilations are suppressed if the dark matter mass is sufficiently high and the dark fine structure constant ^ is sufficiently small. The correct relic abundance can be obtained if the dark matter also couples to the conventional weak interactions, and we verify that this is consistent with particle-physics constraints. The primary limit on ^ comes from the demand that the dark matter be eectively collisionless in galactic dynamics, which implies ^ <
103 for TeV-scale dark matter. These values are easily compatible with constraints from structure formation and primordial nucleosynthesis. We raise the prospect of interesting new plasma eects in dark matter dynamics, which remain to be explored."

 

[ZapperZ]

If you wish to discuss dark matter, then please do so in the appropriate forum.

I have no idea why you would copy the abstract here. It's not as if I can't click a link and read it myself.

This thread is done.

Zz.