La physique de la matière hadronique à haute température telle que décrite par la chromodynamique quantique sur réseau espace–temps

1989 ◽  
Vol 67 (12) ◽  
pp. 1228-1249 ◽  
Author(s):  
Jean Potvin
Keyword(s):  
Phase Transition ◽  
Numerical Simulation ◽  
High Temperature ◽  
Critical Temperature ◽  
Quantum Chromodynamics ◽  
Quark Gluon Plasma ◽  
Gluon Plasma ◽  
Heavy Quarks ◽  
Hadronic Matter ◽  
The Past

The numerical simulation of quantum chromodynamics on a space–time lattice allows for the calculation of many properties of hadronic matter at high temperature in a direct and in a nonperturbative fashion. This paper will be a review of the calculation techniques and results published in the past 5 years. Among other things, I will discuss the order of the phase transition, the critical temperature, the force between heavy quarks, as well as the thermodynamics and the spectroscopy of the quark–gluon plasma.

Constraints for critical temperature of the phase transition into the quark-gluon plasma

1991 ◽  
Vol 52 (4) ◽  
pp. 563-565 ◽  
Author(s):  
L. A. Kondratyuk ◽  
B. V. Martemyanov ◽  
M. I. Krivoruchenko
Keyword(s):  
Phase Transition ◽  
Critical Temperature ◽  
Quark Gluon Plasma ◽  
Gluon Plasma

scholarly journals Thermodynamics and statistical physics of quasiparticles within the quark–gluon plasma model

2020 ◽  
Vol 35 (23) ◽  
pp. 2050194
Author(s):  
Vladimir Dzhunushaliev ◽  
Vladimir Folomeev ◽  
Tlekkabul Ramazanov ◽  
Tolegen Kozhamkulov
Keyword(s):  
Phase Transition ◽  
Thermodynamic Properties ◽  
Quantum Chromodynamics ◽  
Internal Energy ◽  
Quark Gluon Plasma ◽  
Statistical Physics ◽  
Gluon Plasma ◽  
Plasma Model ◽  
Van Der Waals Equation ◽  
Average Value

We consider thermodynamic properties of a quark–gluon plasma related to quasiparticles having the internal structure. For this purpose, we employ a possible analogy between quantum chromodynamics and non-Abelian Proca-Dirac-Higgs theory. The influence of characteristic sizes of the quasiparticles on such thermodynamic properties of the quark–gluon plasma like the internal energy and pressure is studied. Sizes of the quasiparticles are taken into account in the spirit of the van der Waals equation but we take into consideration that the quasiparticles have different sizes, and the average value of these sizes depends on temperature. It is shown that this results in a change in the internal energy and pressure of the quark–gluon plasma. Also, we show that, when the temperature increases, the average value of characteristic sizes of the quasiparticles increases as well. This leads to the occurrence of a phase transition at the temperature at which the volume occupied by the quasiparticles is compared with the volume occupied by the plasma.

Relativistic Finite-Volume Effect of Baryons and Phase Transition to the Quark-Gluon Plasma

1998 ◽  
Vol 07 (05) ◽  
pp. 573-584
Author(s):  
Xiao-Bing Zhang ◽  
Qi-Ren Zhang
Keyword(s):  
Phase Transition ◽  
Finite Volume ◽  
Quark Gluon Plasma ◽  
Relativistic Theory ◽  
Gluon Plasma ◽  
Volume Effect ◽  
Hadronic Matter ◽  
Relativistic Treatment ◽  
Consistent Treatment

We compare a relativistic and thermodynamically consistent treatment for the finite-volume effect of baryons in the phase transition between hadronic matter and quark-gluon plasma, with the previous non-relativistic treatment. We find that, according to the relativistic theory, this phase transition is possible only when the baryonic spectrum is upper bounded.

Theoretical Evaluations of Probability of Photons Yield Depending on Quantum Chromodynamics Theory

2018 ◽  
pp. 183
Author(s):  
Hadi J M Al-Agealy ◽  
Mudhafar J Sahib
Keyword(s):  
Critical Temperature ◽  
Quantum Chromodynamics ◽  
Quark Gluon Plasma ◽  
High Energy Physics ◽  
Gluon Plasma ◽  
High Energy ◽  
Coupling Constant ◽  
Character System ◽  
Quark Interaction ◽  
Quark Charge

      Aim of this research is the description with evaluation the photons rate probability at quark-gluon reactions processes theoretically depending on quantum color theory. In high energy physics as well as quantum field theory and quantum chromodynamics theory,they are very important for physical processes. In quark–gluon interaction there are many processes, the Compton scattering, annihilation pairs and quark–gluon plasma. There are many quantum features, each of three  and systems that taken which could make a quark–gluon plasma in character system. First, electric quark charge and color quantum charge that’s satisfied by quantum number. Second, the critical temperature and photon energy. Moreover, for such three systems have variety quantum flavor numbers: 2, 3 and 4, the photons rate are evaluated at system energy limited  with critical temperature: 144 MeV. However, due to the quark–gluon plasma producing in heavy ions collisions, the photons rate is   increasing with decreasing of coupling constant and photons energy in quark-quark interaction systems.  

Skyrmions at high density

2017 ◽  
Vol 26 (01n02) ◽  
pp. 1740029
Author(s):  
Vicente Vento
Keyword(s):  
Phase Transition ◽  
Phase Diagram ◽  
Nuclear Matter ◽  
Quantum Chromodynamics ◽  
Quark Model ◽  
Quark Gluon Plasma ◽  
Gluon Plasma ◽  
High Density ◽  
Chiral Quark Model

The phase diagram of quantum chromodynamics is conjectured to have a rich structure containing at least three forms of matter: hadronic nuclear matter, quarkyonic matter and quark–gluon plasma. We justify the origin of the quarkyonic phase transition in a chiral-quark model and describe its formulation in terms of Skyrme crystals.

scholarly journals Cooper Pair-Like Systems at High Temperature and their Role on Fluctuations Near the Critical Temperature

1998 ◽  
Vol 12 (29n31) ◽  
pp. 3216-3219 ◽  
Author(s):  
M. Ausloos ◽  
S. Dorbolo
Keyword(s):  
Phase Transition ◽  
Electrical Resistivity ◽  
High Temperature ◽  
Critical Temperature ◽  
Oxygen Diffusion ◽  
Cooper Pair ◽  
Anomalous Behavior ◽  
Anomalous Effect ◽  
Linear Temperature ◽  
Ybco Sample

A logarithmic behavior is hidden in the linear temperature regime of the electrical resistivity R(T) of some YBCO sample below 2T c where "pairs" break apart, fluctuations occur and "a gap is opening". An anomalous effect also occurs near 200 K in the normal state Hall coefficient. In a simulation of oxygen diffusion in planar 123 YBCO, an anomalous behavior is found in the oxygen-vacancy motion near such a temperature. We claim that the behavior of the specific heat above and near the critical temperature should be reexamined in order to show the influence and implications of fluctuations and dimensionality on the nature of the phase transition and on the true onset temperature.

Study and Investigation of Hard Photons Emission in Heavy Ion Collisions

2021 ◽  
Vol 19 (2) ◽  
pp. 61-65
Author(s):  
Taghreed A. Younis ◽  
Hadi J.M. Al-Agealy
Keyword(s):  
Critical Temperature ◽  
Quark Gluon Plasma ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Heavy Ion Collision ◽  
Hard Photon ◽  
Ion Collisions ◽  
Strength Models ◽  
Ion Collision

This work involves hard photon rate production from quark -gluon plasma QGP interaction in heavy ion collision. Using a quantum chromodynamic model to investigate and calculation of photons rate in 𝑐𝑔 → 𝑠𝑔𝛾 system due to strength coupling, photons rate, temperature of system, flavor number and critical. The photons rate production computed using the perturbative strength models for QGP interactions. The strength coupling was function of temperature of system, flavor number and critical temperature. Its influenced by force with temperature of system, its increased with decreased the temperature and vice versa. The strength coupling has used to examine the confinement and deconfinement of quarks in QGP properties and influence on the photon rate production. In our approach, we calculate the photons rate depending on the strength coupling, photons rate and temperature of system with other factors. The results plotted as a function of the photons energy. The photons rate was decreased with increased temperature and increased with decreased with strength coupling.

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