scholarly journals MONOPOLES FROM QUARK CONDENSATES IN QCD

2008 ◽  
Vol 23 (27n30) ◽  
pp. 2356-2359
Author(s):  
M. N. CHERNODUB
Keyword(s):  
Chiral Symmetry ◽  
Quark Gluon Plasma ◽  
Gluon Plasma ◽  
Chiral Condensate ◽  
Quark Condensate ◽  
Chiral Symmetry Restoration ◽  
Gauge Invariant ◽  
Different Temperatures

Chiral monopoles are hedgehoglike structures in local chiral condensates in QCD. These monopoles are (i) made of quark and gluon fields; (ii) explicitly gauge-invariant; (iii) they carry quantized and conserved chromomagnetic charge. We argue that the chiral condensate vanishes in a core of the chiral monopole while the density of these monopoles increases with temperature wiping out the quark condensate in quark-gluon plasma. We suggest that the chiral monopoles are responsible for the chiral symmetry restoration in QCD. We also argue that the chiral monopoles are unlikely to be responsible for confinement of color. Thus, phenomena of the chiral symmetry restoration and the color deconfinement in QCD are not necessarily related to each other and the corresponding transitions may happen at different temperatures.

scholarly journals Gauge-invariant condensation in the nonequilibrium quark-gluon plasma

2020 ◽  
Vol 102 (3) ◽  
Author(s):  
Jürgen Berges ◽  
Kirill Boguslavski ◽  
Mark Mace ◽  
Jan M. Pawlowski
Keyword(s):  
Quark Gluon Plasma ◽  
Gluon Plasma ◽  
Gauge Invariant

scholarly journals NUCLEON SIGMA TERM AND IN-MEDIUM QUARK CONDENSATE IN THE MODIFIED Quark–MESON COUPLING MODEL

1999 ◽  
Vol 14 (04) ◽  
pp. 289-297 ◽  
Author(s):  
XUEMIN JIN ◽  
MANUEL MALHEIRO
Keyword(s):  
Chiral Symmetry ◽  
Linear Order ◽  
Coupling Model ◽  
Quark Condensate ◽  
Chiral Symmetry Restoration ◽  
Density Dependent ◽  
Sigma Term ◽  
Meson Coupling ◽  
Model Independent ◽  
Bag Constant

We evaluate the nucleon sigma term and in-medium quark condensate in the modified quark–meson coupling model which features a density-dependent bag constant. We obtain a nucleon sigma term consistent with its empirical value, which requires a significant reduction of the bag constant in the nuclear medium similar to those found in the previous works. The resulting in-medium quark condensate at low densities agrees well with the model-independent linear order result. At higher densities, the magnitude of the in-medium quark condensate tends to increase, indicating no tendency towards chiral symmetry restoration.

scholarly journals Deconfinement in QCD with Dynamical Quarks

1997 ◽  
Vol 12 (13) ◽  
pp. 949-961 ◽  
Author(s):  
O. Borisenko ◽  
M. Faber ◽  
G. Zinovjev
Keyword(s):  
Phase Transition ◽  
Chiral Symmetry ◽  
Canonical Ensemble ◽  
Three Dimensional ◽  
Chiral Condensate ◽  
Chiral Symmetry Restoration ◽  
Coupling Region ◽  
Effective Potentials ◽  
Deconfinement Phase Transition ◽  
Grand Canonical

We study the phase structure of full QCD within the canonical ensemble (CE) with respect to triality in a lattice formulation. The procedure to calculate the effective potentials (EP) in the CE is given. We calculate the EP for the three-dimensional SU(2) gauge model at finite temperature in the strong coupling region. The potential exhibits a genuine deconfinement phase transition unlike the similar potential obtained in the grand canonical ensemble (GCE). Furthermore, we investigate the EP with the chiral condensate included. Contrary to other recent results we find chiral symmetry restoration in all triality sectors. Dealing with massless staggered fermions we observe chiral symmetry restoration accompanying a deconfinement phase transition of first-order. Above the critical point, besides two Z(2) symmetric "deconfining" vacua there exists a metastable "confining" vacuum in a wide region of the (Nt,γ)-plane. Such a picture could be interpreted as an indication for a mixed state of hadrons and quarks in the vicinity of the critical line.

scholarly journals Medium effects and parity doubling of hyperons across the deconfinement phase transition

2018 ◽  
Vol 175 ◽  
pp. 07016 ◽  
Author(s):  
Gert Aarts ◽  
Chris Allton ◽  
Davide De Boni ◽  
Simon Hands ◽  
Benjamin Jäger ◽  
...  
Keyword(s):  
Quark Gluon Plasma ◽  
Heavy Ion Phenomenology ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Negative Parity ◽  
Chiral Symmetry Restoration ◽  
Medium Effects ◽  
Deconfinement Phase Transition ◽  
The Masses ◽  
S Quarks

We analyse the behaviour of hyperons with strangeness S = –1,–2,–3 in the hadronic and quark gluon plasma phases, with particular interest in parity doubling and its emergence as the temperature grows. This study uses our FASTSUM anisotropic Nf = 2+1 ensembles, with four temperatures below and four above the deconfinement transition temperature, Tc. The positive-parity groundstate masses are found to be largely temperature independent below Tc, whereas the negative-parity ones decrease considerably as the temperature increases. Close to the transition, the masses are almost degenerate, in line with the expectation from chiral symmetry restoration. This may be of interest for heavy-ion phenomenology. In particular we show an application of this effect to the Hadron Resonance Gas model. A clear signal of parity doubling is found above Tc in all hyperon channels, with the strength of the effect depending on the number of s-quarks in the baryons.

scholarly journals From noninteracting to interacting picture of quark–gluon plasma in the presence of a magnetic field and its fluid property

2021 ◽  
pp. 2150044
Author(s):  
Jayanta Dey ◽  
Sarthak Satapathy ◽  
Ankita Mishra ◽  
Souvik Paul ◽  
Sabyasachi Ghosh
Keyword(s):  
Magnetic Field ◽  
Energy Density ◽  
Quark Gluon Plasma ◽  
Transport Coefficients ◽  
Average Energy ◽  
Gluon Plasma ◽  
Quark Condensate ◽  
Lattice Quantum Chromodynamics ◽  
Field Dependent ◽  
Lattice Quantum

We have attempted to build a parametric-based simplified and analytical model to map the interaction of quarks and gluons in the presence of magnetic field, which has been constrained by quark condensate and thermodynamical quantities like pressure, energy density, etc., obtained from the calculation of lattice quantum chromodynamics (QCDs). To fulfill that mapping, we have assumed a parametric temperature and magnetic field-dependent degeneracy factor, average energy, momentum and velocity of quarks and gluons. Implementing this QCD interaction in calculation of transport coefficient at finite magnetic field, we have noticed that magnetic field and interaction both are two dominating sources, for which the values of transport coefficients can be reduced. Though the methodology is not so robust, but with the help of its simple parametric expressions, one can get a quick rough estimation of any phenomenological quantity, influenced by temperature and magnetic field-dependent QCD interaction.

scholarly journals CHIRAL CONDENSATE IN NUCLEAR MATTER WITH VACUUM CORRECTIONS

2008 ◽  
Vol 23 (40) ◽  
pp. 3393-3403 ◽  
Author(s):  
WEI-ZHOU JIANG ◽  
BAO-AN LI
Keyword(s):  
Equation Of State ◽  
Nuclear Matter ◽  
Chiral Symmetry ◽  
Scaling Law ◽  
Chiral Condensate ◽  
Chiral Symmetry Restoration ◽  
Density Dependent ◽  
Dirac Sea

Within the relativistic Hartree approach using a Lagrangian with density-dependent parameters according to the Brown–Rho scaling law, it is found that the vacuum corrections from the nucleon Dirac sea soften the equation of state and favor the chiral symmetry restoration at high densities.

scholarly journals Quarkonia Production and Dissociation in a Langevin Approach

Proceedings ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 30
Author(s):  
Nadja Krenz ◽  
Hendrik van Hees ◽  
Carsten Greiner
Keyword(s):  
Time Evolution ◽  
Quark Gluon Plasma ◽  
Gluon Plasma ◽  
Heavy Quarks ◽  
Equilibrium Limit ◽  
Quark Pairs ◽  
Thermal Distribution ◽  
Langevin Approach ◽  
Different Temperatures

We aim to describe the process of dissociation and recombination of quarkonia in the quark-gluon plasma. Therefore we developed a model which allows to observe the time evolution of a system with various numbers of charm-anticharm-quark pairs at different temperatures. The motion of the heavy quarks is realized within a Langevin approach. We use a simplified version of a formalism developed by Blaizot et al. in which an Abelian plasma is considered where the heavy quarks interact over a Coulomb like potential. We have demonstrated, that the system reaches the expected thermal distribution in the equilibrium limit.

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