Questions tagged [quark-gluon-plasma]
A state of matter in which quarks and gluons are freed of their strong attraction for one another under extremely high energy densities.
45
questions
8
votes
1
answer
1k
views
Why did the quark epoch occur earlier than the lepton epoch?
I don't understand the reason and hypothesis behind why the quarks appeared first—as per the big bang cosmology—shortly after the strong and electroweak force separated. We don't know what the quarks ...
0
votes
1
answer
50
views
Could charm, bottom, and even top matter form under the right circumstances?
Strange matter forms because turning some of the down quarks into strange quarks unlocks lower energy levels, and this can lower the system's overall energy at high densities. If the density was ...
- 734
0
votes
1
answer
61
views
Is quark-quark interaction possible under extreme heat and pressure circumstances?
The neutron-rich core of neutron stars, underneath extreme pressure and heat, undergoes a phase transition to quark-gluon plasma. If both heat and pressure are increased to exceed beyond the TOV limit,...
- 83
0
votes
0
answers
61
views
Why does color confinement fail at high temperatures?
The explanation for color confinement that I see everywhere is that as the distance between quarks increases, the strong force between them approaches a constant value. Once the quarks get far enough ...
- 734
0
votes
3
answers
133
views
How exactly does the quark gluon plasma prevent protons from forming?
I have read this question:
The difference is that the quark-gluon plasma is governed by the dynamics of the strong interaction, which isn't very well understood, so that's what people are interested ...
- 25.3k
0
votes
1
answer
44
views
Color-magnetic fields in quark-gluon plasma?
I was curious as to whether there is a color equivalent of magnetic field in CCD. The answers here suggest there is, but only at femtometre scales due to confinement. Is this the case also for the ...
- 101
1
vote
1
answer
105
views
If singular Quarks cannot exist on their own, then how is Quark-Gluon Plasma possible?
To my understanding, QGP is a theoretical form of matter where quarks are freely floating around. I understand immense temperature and pressure is required to form this. Also to my knowledge, quarks ...
0
votes
0
answers
38
views
Why we multiply the quark contribution term by 7/8 while calculating the degrees of freedom for QGP?
Why we multiply the quark contribution term by 7/8 while calculating the degrees of freedom for two flavour QGP?
That is,
g = 7/8 (2×2×2×3) + 2 × 8
Why there is a factor factor of 7/8 ?
0
votes
1
answer
61
views
What’s the basic procedure to draw a QCD phase diagram?
Could someone recommend a book/resource where I can find a detailed way of sketching out a QCD temperature-chemical potential phase diagram using gap equations (eg. equations 35-37 or 39-40 as given ...
- 335
2
votes
2
answers
53
views
Why is strangeness enhanced in quark-gluon plasma?
How does the observation of strangeness enhancement in high-multiplicity proton–proton collisions explain the existence of quark-gluon plasma?
- 115
6
votes
2
answers
1k
views
What is Hagedorn Temperature?
I would like to get an understanding of the value of the Hagedorn temperature and the units this temperature can be given in. Is the Hagedorn temperature the maximum temperature, just as $0\ K$ is the ...
- 115
2
votes
2
answers
100
views
Why photon do not interact in quark gluon plasma?
It is often said that we could probe quark gluon plasma with photon or dileptons, because they interact electromagnetically so tha tthey don't modify the medium.
But do they do not modify the medium ?...
0
votes
1
answer
34
views
What is the link between the energies of particles and the corresponding temperature, in context of quark gluon plasma?
What is the link between the energies of particles and the corresponding temperature, in context of quark gluon plasma ?
Is quark gluon plasma existing at low or high energy of particles ? Or is it ...
0
votes
1
answer
44
views
Quark gluon plasma at arbitrarily high temperature
Does the quark-gluon plasma become weakly coupled at infinite temperature (due to asymptotic freedom), or does it maintain some non-perturbative behavior?
- 855
0
votes
1
answer
81
views
Which equations of QCD are the QGP (Quark Gluon Plasma) and QCD phase diagram coming from? [closed]
Which equations of QCD are the QGP (Quark Gluon Plasma) and QCD phase diagram coming from ?
Are there derivation formulas ?
2
votes
0
answers
33
views
What do you mean by quark gluon plasma is frictionless?
I read about the similarities between quark gluon plasma and Bose Einstein condensate especially both are frictionless, I know generally when everday object rubs against one another the electrons get ...
- 11.4k
4
votes
0
answers
90
views
Is there some truth to the "vacuum as bubbling soup" story?
There are many discussions on this site about the nature and reality of vacuum fluctuations. The general consensus seems to be that this it falls into the Lie-to-Laymen category. On the other hand, ...
- 9,131
5
votes
0
answers
86
views
How would a quark star maintain degeneracy near the surface?
I'm still not exactly understanding how a quark star could possibly exist for more than a fraction of a second. Neutron stars are already hypothesized to have degenerate quark matter at their cores, ...
- 170
0
votes
1
answer
78
views
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)...
0
votes
1
answer
133
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 ...
- 490
5
votes
1
answer
285
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 ...
- 220k
2
votes
2
answers
1k
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)...
- 9,073
2
votes
0
answers
59
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^{\...
- 21
3
votes
2
answers
4k
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 ...
- 580
0
votes
0
answers
46
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 ...
- 486
4
votes
2
answers
136
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 ...
- 1,355
2
votes
1
answer
102
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: ...
- 984
1
vote
2
answers
118
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 ...
- 525
1
vote
1
answer
268
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 ...
- 4,736
5
votes
2
answers
553
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 ...
- 4,736
0
votes
1
answer
121
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 ...
- 1,055
4
votes
0
answers
79
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 ...
- 41
7
votes
0
answers
135
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. ...
- 5,679
1
vote
1
answer
343
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?
0
votes
0
answers
143
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 ...
- 131
3
votes
0
answers
68
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 ...
- 1,482
1
vote
5
answers
292
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?
- 2,375
1
vote
1
answer
220
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 ...
- 855
1
vote
1
answer
238
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 ...
- 5,373
7
votes
1
answer
206
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 ...
3
votes
1
answer
807
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 ...
- 855
5
votes
4
answers
2k
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 ...
- 1,978
0
votes
1
answer
119
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 ?
- 875
1
vote
0
answers
273
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 ...
- 19
1
vote
1
answer
367
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–...
- 106