Skip to main content

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.

Filter by
Sorted by
Tagged with
0 votes
1 answer
112 views

Are pure quark stars possible?

Has it been established that structures formed from quarks (like quark stars: https://en.wikipedia.org/wiki/Quark_star) are possible in principle ? I have read about the possibility that inside ...
vengaq's user avatar
  • 2,472
2 votes
1 answer
86 views

Is quark-gluon plasma dense enough to have an event horizon with enough of it?

I've taken a few cracks and figuring this out myself, as a novice, with the equations $r_s=\frac{2GM}{c^2}$ and $M = \frac{4}{3}\rho \pi r^3$ but I think I'm just spinning in circles. Is quark-gluon ...
MikeHelland's user avatar
0 votes
0 answers
24 views

Is creation of quark-gluon plasma endothermic?

When we create quark-gluon plasma in a lab by colliding lead nuclei, does releasing the nuclear bonds give us energy? Or take it? An astrophysical jet could be as hot as 10 trillion K: https://www....
MikeHelland's user avatar
0 votes
0 answers
18 views

Which hadrons were present after the phase transition from the post-Big Bang QGP?

This question relates to the "hadron epoch" (after the initial quark-gluon plasma, but before the end of baryogenesis). My understanding is that the phase transition that ends the quark-...
SgtJohn74's user avatar
1 vote
1 answer
85 views

Matter-antimatter asymmetry during hadronization

When quark gluon plasma is created during heavy ion collisions, the QGP exists extremely briefly before hadronizing--the process where the QGP cools and quarks combine to form colorless hadrons. A ...
klippo 's user avatar
  • 867
3 votes
1 answer
56 views

Can the quark-gluon plasma of the very early universe be accurately characterized as a type of quark star?

The very early universe was dense and opaque. During the quark epoch, the entirety of the universe, up to every boundary, was a filled-in ball of QGP. Much like a star is a ball of ionized nuclei that ...
blacktopshaman's user avatar
0 votes
1 answer
72 views

Could there be a hybrid particle made of one quark and one or several gluons?

The question's background is that such a quark-gluon bound state might be colour-less. But it seems that no such particle is ever mentioned. Is there a reason speaking against its existence? ADDED: ...
KlausK's user avatar
  • 727
0 votes
0 answers
70 views

Can an electroweak plasma exist at room temperature?

Above around 246 GeV ($10^{15}$ Kelvin), the weak and electromagnetic forces are thought to be merged. See Electroweak interaction. This is thought to occur in the cores of over dense neutron stars ...
Joe Peters's user avatar
6 votes
3 answers
2k views

Can free quarks exist?

I know that currently free quarks do not exist but can they exist under any circumstance? The Physicsworld article Quarks break free at two trillion degrees states that they do but I want a ...
Sanket Dash's user avatar
0 votes
1 answer
144 views

What particles existed in the Planck, GUT, and electroweak epochs, respectively?

What quarks, leptons, and bosons existed in each of the individual epochs of the early universe (Planck, GUT, electroweak)? Did the quantum zoo gain or lose species during these times? Or did some of ...
blacktopshaman's user avatar
0 votes
1 answer
102 views

Why does Pseudorapidity distribution have two peaks?

I found plots(fig2) that state that it is the sum of two gaussian distributions, but I am not able to understand its physical significance. Any help would be appreciated.[PS Why does rapidity not have ...
hawexrutile's user avatar
9 votes
1 answer
2k 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 ...
Rivu Adhikary's user avatar
0 votes
1 answer
137 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 ...
zucculent's user avatar
  • 1,405
0 votes
1 answer
85 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,...
goose's user avatar
  • 83
0 votes
3 answers
409 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 ...
Árpád Szendrei's user avatar
0 votes
1 answer
62 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 ...
RobbieB's user avatar
  • 101
1 vote
1 answer
170 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 ...
Michael Stemerman's user avatar
0 votes
0 answers
85 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 ?
Murad Badshah's user avatar
1 vote
1 answer
132 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 ...
user263315's user avatar
2 votes
2 answers
128 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?
Jens Vigen's user avatar
7 votes
2 answers
2k 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 ...
Jens Vigen's user avatar
2 votes
2 answers
176 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 ?...
Mathieu Krisztian's user avatar
0 votes
1 answer
44 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 ...
Mathieu Krisztian's user avatar
0 votes
1 answer
56 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?
Physics_Plasma's user avatar
0 votes
1 answer
136 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 ?
Mathieu Krisztian's user avatar
2 votes
0 answers
50 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 ...
user6760's user avatar
  • 13k
4 votes
0 answers
130 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, ...
jak's user avatar
  • 10.1k
5 votes
0 answers
109 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, ...
Snowshard's user avatar
  • 170
1 vote
2 answers
154 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)...
anglina ch's user avatar
0 votes
1 answer
187 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 ...
SurpriseDog's user avatar
5 votes
1 answer
329 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 ...
anna v's user avatar
  • 234k
3 votes
2 answers
3k 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)...
Solidification's user avatar
2 votes
0 answers
77 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^{\...
4815162342's user avatar
4 votes
2 answers
7k 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 ...
user157860's user avatar
0 votes
0 answers
65 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 ...
Samapan Bhadury's user avatar
4 votes
2 answers
163 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 ...
Joshua's user avatar
  • 1,373
2 votes
1 answer
184 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: ...
MBolin's user avatar
  • 1,154
1 vote
2 answers
130 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 ...
user189728's user avatar
1 vote
1 answer
333 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 ...
SchrodingersCat's user avatar
5 votes
2 answers
617 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 ...
SchrodingersCat's user avatar
0 votes
1 answer
179 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 ...
Matas Vaitkevicius's user avatar
4 votes
0 answers
88 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 ...
E Reid's user avatar
  • 41
7 votes
0 answers
143 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. ...
Yossarian's user avatar
  • 6,067
1 vote
1 answer
465 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?
Rostislav  Senko's user avatar
0 votes
0 answers
145 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 ...
sara's user avatar
  • 151
3 votes
0 answers
73 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 ...
Physics Moron's user avatar
1 vote
5 answers
351 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?
Jitter's user avatar
  • 2,421
1 vote
1 answer
302 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 ...
Physics_Plasma's user avatar
1 vote
1 answer
325 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 ...
riemannium's user avatar
  • 6,611
7 votes
1 answer
282 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 ...