scholarly journals Magnetized QCD phase diagram: critical end points for the strange quark phase transition driven by external magnetic fields

2018 ◽  
Author(s):  
Pedro Costa ◽  
Márcio Ferreira ◽  
Constança Providência
Keyword(s):  
Phase Transition ◽  
Phase Diagram ◽  
Magnetic Fields ◽  
Strange Quark ◽  
End Points ◽  
Qcd Phase Diagram ◽  
Quark Phase

scholarly journals The QCD Phase-Diagram Obtained from the NJL and the Extended-NJL Models for Quark and Hadron Phases

2017 ◽  
Vol 45 ◽  
pp. 1760059
Author(s):  
Clebson A. Graeff ◽  
Débora P. Menezes
Keyword(s):  
Phase Transition ◽  
Phase Diagram ◽  
Equations Of State ◽  
Original Formulation ◽  
Qcd Phase Diagram ◽  
Hadron Phase ◽  
Vector Interaction ◽  
Njl Model ◽  
Quark Phase

We analyse the hadron/quark phase transition described by the Nambu-Jona-Lasinio (NJL) model [quark phase] and the extended Nambu-Jona-Lasinio model (eNJL) [hadron phase]. While the original formulation of the NJL model is not capable of describing hadronic properties due to its lack of confinement, it can be extended with a scalar-vector interaction so it exhibits this property, the so-called eNJL model. As part of this analysis, we obtain the equations of state within the SU(2) versions of both models for the hadron and the quark phases and determine the binodal surface.

scholarly journals Hadron-quark phase transition: the QCD phase diagram and stellar conversion

2019 ◽  
Vol 2019 (01) ◽  
pp. 024-024
Author(s):  
Clebson A. Graeff ◽  
Marcelo D. Alloy ◽  
Kauan D. Marquez ◽  
Constança Providência ◽  
Débora P. Menezes
Keyword(s):  
Phase Transition ◽  
Phase Diagram ◽  
Qcd Phase Diagram ◽  
Quark Phase

scholarly journals Resonance states in an effective chiral hadronic model

Open Physics ◽  
2012 ◽  
Vol 10 (6) ◽  
Author(s):  
Philip Rau ◽  
Jan Steinheimer ◽  
Stefan Schramm ◽  
Horst Stöcker
Keyword(s):  
Phase Transition ◽  
Phase Diagram ◽  
Thermodynamic Properties ◽  
Lattice Qcd ◽  
Strange Quark ◽  
Vector Fields ◽  
Qcd Phase Diagram ◽  
Scalar And Vector Fields ◽  
Hadronic Resonances ◽  
Hadronic Model

AbstractWith an effective chiral flavour SU(3) model we show the effect of hadronic resonances on the QCD phase diagram. We state that varying the resonance couplings to the scalar and vector fields affects the order and location of the phase transition, the possible existence of a critical end point (CEP), and the thermodynamic properties. We present (strange) quark number susceptibilities at zero baryochemical potential and at three different points at the phase transition. Comparing results to lattice QCD, we state that reasonable large vector couplings limit the phase transition to a smooth crossover ruling out a CEP.

scholarly journals On SU(3) Effective Models and Chiral Phase Transition

2015 ◽  
Vol 2015 ◽  
pp. 1-15 ◽  
Author(s):  
Abdel Nasser Tawfik ◽  
Niseem Magdy
Keyword(s):  
Phase Transition ◽  
Phase Diagram ◽  
Lattice Qcd ◽  
High Energy ◽  
Particle Model ◽  
Chiral Phase ◽  
Chiral Phase Transition ◽  
Thermal Models ◽  
Qcd Phase Diagram ◽  
Freeze Out

Sensitivity of Polyakov Nambu-Jona-Lasinio (PNJL) model and Polyakov linear sigma-model (PLSM) has been utilized in studying QCD phase-diagram. From quasi-particle model (QPM) a gluonic sector is integrated into LSM. The hadron resonance gas (HRG) model is used in calculating the thermal and dense dependence of quark-antiquark condensate. We review these four models with respect to their descriptions for the chiral phase transition. We analyze the chiral order parameter, normalized net-strange condensate, and chiral phase-diagram and compare the results with recent lattice calculations. We find that PLSM chiral boundary is located in upper band of the lattice QCD calculations and agree well with the freeze-out results deduced from various high-energy experiments and thermal models. Also, we find that the chiral temperature calculated from HRG is larger than that from PLSM. This is also larger than the freeze-out temperatures calculated in lattice QCD and deduced from experiments and thermal models. The corresponding temperature and chemical potential are very similar to that of PLSM. Although the results from PNJL and QLSM keep the same behavior, their chiral temperature is higher than that of PLSM and HRG. This might be interpreted due the very heavy quark masses implemented in both models.

scholarly journals Thermodynamics of strong-interaction matter from lattice QCD

2015 ◽  
Vol 24 (10) ◽  
pp. 1530007 ◽  
Author(s):  
Heng-Tong Ding ◽  
Frithjof Karsch ◽  
Swagato Mukherjee
Keyword(s):  
Phase Diagram ◽  
High Temperature ◽  
Magnetic Fields ◽  
Lattice Qcd ◽  
Strong Interaction ◽  
Dense Matter ◽  
Heavy Ion ◽  
Qcd Phase Diagram ◽  
Bulk Thermodynamics ◽  
Strong Interaction Matter

We review results from lattice QCD calculations on the thermodynamics of strong-interaction matter with emphasis on input these calculations can provide to the exploration of the phase diagram and properties of hot and dense matter created in heavy ion experiments. This review is organized in sections as follows: (1) Introduction, (2) QCD thermodynamics on the lattice, (3) QCD phase diagram at high temperature, (4) Bulk thermodynamics, (5) Fluctuations of conserved charges, (6) Transport properties, (7) Open heavy flavors and heavy quarkonia, (8) QCD in external magnetic fields, (9) Summary.

scholarly journals CRYSTAL-FIELD EFFECTS IN THE FIRST-ORDER VALENCE TRANSITION IN YbInCu4 INDUCED BY EXTERNAL MAGNETIC FIELD

2002 ◽  
Vol 16 (20n22) ◽  
pp. 3306-3306 ◽  
Author(s):  
M. DZERO
Keyword(s):  
Magnetic Field ◽  
Phase Transition ◽  
Phase Diagram ◽  
External Magnetic Field ◽  
Magnetic Fields ◽  
Crystal Field ◽  
Valence Transition ◽  
First Order ◽  
Field Effects ◽  
Wide Range

As it was shown earlier [Dzero, Gor'kov and Zvezdin, J. Phys.: Condens. Matt.12, L711 (1000)], the properties of the first-order valence phase transition in YbInCu4 in the wide range of magnetic fields and temperatures are perfectly described in terms of a simple entropy transition for free Yb ions. Within this approach, the crystal field effects have been taken into account and we show that the phase diagram in the B - T plane acquires some anisotropy with respect to the direction of an external magnetic field.

HYBRID STARS WITH DELTA MATTER AND COLOR–FLAVOR LOCKED QUARK PHASE

2008 ◽  
Vol 17 (05) ◽  
pp. 737-746 ◽  
Author(s):  
H. RODRIGUES ◽  
J. C. T. OLIVEIRA ◽  
S. B. DUARTE
Keyword(s):  
Phase Transition ◽  
Quark Matter ◽  
Strange Quark ◽  
Bose Condensate ◽  
Hadronic Matter ◽  
Hybrid Stars ◽  
S Quarks ◽  
Quark Phase ◽  
Color Superconductor

The color–flavor locked (CFL) phase is believed to be the fundamental state of strange quark matter (SQM) at high densities. The CFL phase is a color superconductor composed of pairs of u, d and s quarks, with no electrons, forming a Bose condensate. In this work, we analyze a possible phase transition of hadronic matter made of nucleons, Δ–resonances, hyperons and leptons, to CFL superconducting quark matter. An equation of state taking into account this phase transition is employed to determine the characteristics of a hybrid star. The role of the color superconducting gap on the hybrid stars properties is also discussed.

scholarly journals CHIRALLY SYMMETRIC BUT CONFINED HADRONS AT FINITE DENSITY

2008 ◽  
Vol 23 (27n30) ◽  
pp. 2385-2388 ◽  
Author(s):  
L. YA. GLOZMAN ◽  
R. F. WAGENBRUNN
Keyword(s):  
Phase Transition ◽  
Phase Diagram ◽  
Low Temperature ◽  
Quark Matter ◽  
Chemical Potential ◽  
Heavy Ion ◽  
Finite Density ◽  
Qcd Phase Diagram

At a critical finite chemical potential and low temperature QCD undergoes the chiral restoration phase transition. The folklore tradition is that simultaneously hadrons are deconfined and there appears the quark matter. We demonstrate that it is possible to have confined but chirally symmetric hadrons at a finite chemical potential and hence beyond the chiral restoration point at a finite chemical potential and low temperature there could exist a chirally symmetric matter consisting of chirally symmetric but confined hadrons. If it does happen in QCD, then the QCD phase diagram should be reconsidered with obvious implications for heavy ion programs and astrophysics.

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