Questions tagged [quark-gluon-plasma]
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questions
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Why is color screening in Quark Gluon Plasma not effective for light quarks mesons like pions?
The color screening of quarkonia states like $J/\psi$ (bound states of charm and anti-charm) and $\Upsilon$ (bound states of beauty and anti-beauty) is considered one signal of QGP (quark-gluon plasma)...
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81 views
Do Quarks decay into Photons at high enough temperatures?
At high enough energy, particles lose coherence and are ripped apart into a Quark-gluon plasma where the individual quarks can break free of the atomic nucleus and fly around unencumbered.
A black ...
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1answer
97 views
Detecting the electroweak unification in data of quark gluon plasma
Electroweak unification is discussed in the Big Bang model and variant proposals, and there is a transition at energies of 100 GeV where the EW symmetry is unbroken and a quark gluon plasma phase ...
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2answers
176 views
If quarks can't be isolated in the first place, how did they become confined in the early universe?
On one hand, we know that quarks cannot exist in isolation. This is because the energy required to dissociate a quark-antiquark pair in a meson (or quarks in a hadron) will create a mesons (or hadrons)...
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47 views
s-wave radial equation for minimally coupled scalar field
I am trying to work through the calculations from the following article.
I need to find the s-wave radial wave equation for a minimally coupled scalar field, given by $\partial_{\mu}( \sqrt {-g} g^{\...
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2answers
502 views
When/ how were/are quarks formed?
We know that all particles can eventually be converted into energy. We know also that electrons were and still are formed by pair production from a 1MeV photon.
Do physicists have yet any idea how ...
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21 views
Bag model and MFT
Can I think of the MIT Bag model as an application of mean field theory (MFT) in nthe domain of nuclear physics? All the interactions between quarks are mediated via strong interaction, whose exact ...
3
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2answers
95 views
Is it sensible to talk about protons at the time when the universe was a quark-gluon plasma?
I'm currently studying from "Particle Astrophysics" by Perkins.
On page 132 it says:
After $kT$ fell below the strong quantum
chromodynamics (QCD) scale parameter ∼ $200$ MeV, the remaining ...
2
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1answer
45 views
Hadron contribution to effective degrees of freedom in early Universe
In transition from quark-gluon plasma to hadron gas in the early Universe, the value of the effective degrees of freedom $g_{\star}$ decreases abruptly. This seems to me like a sort of decoupling: ...
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2answers
99 views
Can nuclei ever “liquify”?
I've been reading about degenerate matter and how extreme temperatures and pressures can impact the way it organizes itself. Plasma is a type of matter where the energy of the matter allows electrons ...
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1answer
159 views
Are bottomonium and charmonium the only quarkonium systems?
I had a question:
Are bottomonium and charmonium the only quarkonium systems?
I was searching the internet and found that these two systems have been experimetally observed but the toponium has ...
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2answers
489 views
Are perturbative and non-perturbative QCD both signs of new physics?
I was studying about quarkonia systems and reached this page at CERN Courier. Here, I came across the following text:
While the failure to reproduce an experimental observable that is ...
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1answer
144 views
Measuring and calculating free quark masses
Particle data book contains masses of the free quarks. I wonder, how do experimentalists determine the masses of the free quarks even though they are trapped inside hadrons (except perhaps in quark-...
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1answer
79 views
Where did all the negative potential energy in gluons went to?
I have watched PBS Space Time that gluons could be viewed as negative potential energy (tension between quarks) and that they actually are 99% of all the mass in protons and neutrons.
Now the way I ...
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0answers
66 views
Strong force equivalent of electricity?
Could colour charges be manipulated into something analogous to the flow of electricity, and if so, would there be any situation in which circuits of this kind would be useful? For example, given a ...
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0answers
108 views
Doubts about quark confinement, the pole mass and the quark gluon plasma
I have seen written a few times that the notion of a pole mass for a quark contradicts the quark confinement picture and that non-perturbatively it is expected that the quark pole mass be infinite. ...
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1answer
282 views
Is it possible to create a quark-gluonic reactor to produce energy with help of strong interaction?
Is it possible to create a quark-gluonic reactor to produce energy with help of strong interaction? Can it be done with quark-gluon plasma?
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125 views
plasma frequency in terms of thermal energy
The relativistic factor (in terms of momentum) is given by
\begin{equation}\label{}
\gamma=1/\sqrt{1-v^{2}/c^{2}}=\sqrt{1+p^{2}/m^{2}_{0}c^{2}},
\end{equation}
When thermal momentum is greater ...
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0answers
58 views
Fluctuating string in AdS black hole
People frequently use fluctuating string in AdS black hole (see 1,2,3 etc) to study dynamics of a "free external quark" in quark-gluon-plasma (QGP) at finite temperature. The background black hole ...
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3answers
166 views
What flavour is quark gluon plasma?
What flavour of quarks make up quark gluon plasma? What would it most likely cool down into, protons, neutrons, strange matter, neutronium or what?
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1answer
151 views
What are non-Abelian plasmas?
I know what a non-Abelian group is: a group whose operation does not obey commutativity. Does this have anything to do with a non-Abelian plasma? I'm not really looking at a specific paper, but I'll ...
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1answer
169 views
Extreme temperatures, relativity and kinetic theory
According to kinetic theory, average kinetic energy is proportional to temperature. Supposing $k_BT/2$ per particle, can we use relativity and kinetic theory to calculate, e.g., the temperature and ...
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1answer
129 views
Reference on stages of heavy ion collisions in particle physics
Is there any reference (book/review article etc.) where the physics of heavy ion collisions is overviewed?
To be absolutely clear about things, I am looking for a introductory review which covers ...
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1answer
691 views
Relationship between plasma physics and quark gluon plasma
To what extent do the ideas common in modern plasma physics, such as magnetohydrodynamics, cold plasma models, common types of plasma waves, Maxwell's Equations, etc, relate to the study of quark ...
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4answers
1k views
How did photons and electrons arise out of the quark-gluon plasma?
I am just beginning to learn about the ideas of the early universe, so this is probably a beginner question.
I understand that protons and neutrons (which are baryons, which are hadrons) are made out ...
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1answer
82 views
What will happen if we will be able to produce a quark-gluon plasma and the we cool it down?
Lets assume that we can produce a quark-gluon plasma and then we try to cool it down, what will happen to it ?
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0answers
269 views
Where does mass come from? [duplicate]
I've read material claiming it comes from the Higgs boson fails while others claim it is from the tensions of quarks in the gluon field... I am only a 15 year old kid in high school so please "dumb it ...
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1answer
312 views
What are the problems in quark-gluon plasma? [closed]
Someone (T.D.Lee?) said that quark-gluon plasma would (after 1980?) be very important to understand high-energy physics experiments.
I read some description of this new state in wikipedia (Quark–...
