Page 2 of 3

Re: False Vacuum

Posted: Wed Dec 23, 2009 7:43 am
by Allan
The quark gluon plasma has been created and studied at RHIC.

http://en.wikipedia.org/wiki/Quark–gluon_plasma

Allan

Re: False Vacuum

Posted: Wed Dec 23, 2009 1:30 pm
by Stephen
But according to Wiki it's still theoretical and is different than the fireballs which were created at RHIC. Maybe I'm paranoid but have they considered my questions?
http://en.wikipedia.org/wiki/Quark%E2%80%93gluon_plasma

Re: False Vacuum

Posted: Wed Dec 23, 2009 5:35 pm
by Allan
I don't follow your reasoning. What I read seems to say at least to me that a QGP has been created. I don't understand your suggestion that there are different forms QGP. I seems to see the QGP as the same no matter where it is created.

Allan

Re: False Vacuum

Posted: Thu Dec 24, 2009 1:31 pm
by Stephen
In the "how it is created in the lab" section the following sentence is written -
They largely pass through each other, but a resulting hot volume called a fireball is created after the collision. Once created, this fireball is expected to expand under its own pressure, and cool while expanding. By carefully studying this flow, experimentalists hope to put the theory to test.
So it means this particular kind of fireball hasn't been created yet. But is it possible, in any way, that this plasma was what caused a phase change of the universe in the past? Is it completely ruled out that high temperatures and high densities don't cause vacuum bubbles to form?

Re: False Vacuum

Posted: Thu Dec 24, 2009 3:29 pm
by Allan
I disagree. I read "fireball is created after the collision" as saying that a QGP is create since that is what the fireball is.

Allan

Re: False Vacuum

Posted: Thu Dec 24, 2009 4:32 pm
by Stephen
Okay, so basically the LHC will create the exact same fireballs created by RHIC? Are those fireballs also created by cosmic rays?

Since they are going to do 3.5 TeV energies soon, I hope to be completely calm by that time.

Re: False Vacuum

Posted: Thu Dec 24, 2009 5:46 pm
by Allan
I think on a very fast read that this document says that QGPs are the best explanation for the results from some of the most energetic cosmic rays. :geek:

http://www.lnf.infn.it/conference/vulc2 ... rukhin.pdf

Allan :mrgreen:

Re: False Vacuum

Posted: Thu Dec 24, 2009 9:58 pm
by Stephen
Well I don't understand a lot of what's written there, but I got a reassuring feeling that the LHC will explore things already present in the universe, and won't create vacuum bubbles (it remains the scariest doomsday theory I've ever heard).

One more thing - it says that 1-14 TeV corresponds to an energy of 10^17 in cosmic rays. Since The highest cosmic rays observed were at 10^20, what amount of TeV energy will a collider need to exceed this energy?

Re: False Vacuum

Posted: Thu Dec 24, 2009 11:32 pm
by Shadowdraxx
I've heard its around 100 TeV + tho I've also noted in some papers stuff upto 1 million TeV


EDIT that "OH MY GOD" cosmic ray that hit us in 1991 was ten millions times higher in energy than the SSC that would have had an energy of 20TeV.

So pretty nuts some of the natural stuff.

http://www.fourmilab.ch/documents/OhMyGodParticle/ < Awesome

Re: False Vacuum

Posted: Tue Jan 26, 2010 7:57 pm
by Stephen
Life was so much better before I knew about this theory.
http://www.youtube.com/watch?v=6LKjJT7gh9s&feature=fvw

Re: False Vacuum

Posted: Tue Jan 26, 2010 8:38 pm
by CharmQuark
Stephen :romance-kisscheek: life would be so much better if we stopped thinking about everything :sad-pacing:

Re: False Vacuum

Posted: Tue Jan 26, 2010 8:40 pm
by Allan
Hi Stephen

Exactly what in that video do you find be so worrisome? :?:

Allan :mrgreen:

Re: False Vacuum

Posted: Tue Jan 26, 2010 9:28 pm
by Stephen
Allan wrote:Hi Stephen

Exactly what in that video do you find be so worrisome? :?:

Allan :mrgreen:
Just the reinforcement of the idea that theoretically a quantum tunneling event could happen at any second and everything would just disappear. I know the chances are astronomically low and all, but just the thought that a vacuum bubble could appear right now and kill me is terrifying.
emmylou wrote:Stephen :romance-kisscheek: life would be so much better if we stopped thinking about everything :sad-pacing:
True, but sometimes you can't control it (or the world). :sleeping-asleep:

Re: False Vacuum

Posted: Tue Jan 26, 2010 9:42 pm
by CharmQuark
True, but sometimes you can't control it (or the world).
This is very true :geek:

Re: False Vacuum

Posted: Fri Feb 12, 2010 5:15 am
by Stephen
josch222 wrote:Since quantum theory, we know that observation makes a difference to the particles. .
You may actually be right.
http://arxiv.org/PS_cache/arxiv/pdf/071 ... 1821v2.pdf