scholarly journals Scalar-isovector δ-meson mean-field and mixed phase structure in compact stars

2010 ◽  
Vol 02 (05) ◽  
pp. 489-493 ◽  
Author(s):  
Grigor Bakhshi Alaverdyan
Keyword(s):  
Phase Structure ◽  
Mean Field ◽  
Mixed Phase ◽  
Compact Stars

Mean-Field Theory Prediction of the Phase Behavior and Phase Structure of Alkyl-Propoxy-Ethoxylate “Graded” Surfactants in Water:  Temperature and Electrolyte Effects

Langmuir ◽  
2003 ◽  
Vol 19 (10) ◽  
pp. 4483-4492 ◽  
Author(s):  
Nadezhda P. Shusharina ◽  
Sudhakar Balijepalli ◽  
Henri J. M. Gruenbauer ◽  
Paschalis Alexandridis
Keyword(s):  
Field Theory ◽  
Water Temperature ◽  
Phase Behavior ◽  
Phase Structure ◽  
Mean Field Theory ◽  
Mean Field ◽  
Electrolyte Effects

scholarly journals Charge screening effect on hadron-quark mixed phase in compact stars

2006 ◽  
Author(s):  
Tomoki Endo ◽  
Toshiki Maruyama ◽  
Satoshi Chiba ◽  
Toshitaka Tatsumi
Keyword(s):  
Mixed Phase ◽  
Compact Stars ◽  
Screening Effect ◽  
Charge Screening

scholarly journals SU(3) Polyakov linear-sigma model with finite isospin asymmetry: QCD phase diagram

2019 ◽  
Vol 34 (31) ◽  
pp. 1950199 ◽  
Author(s):  
Abdel Nasser Tawfik ◽  
Abdel Magied Diab ◽  
M. T. Ghoneim ◽  
H. Anwer
Keyword(s):  
Phase Structure ◽  
Sigma Model ◽  
Chemical Potential ◽  
Mean Field ◽  
Field Approximation ◽  
Linear Sigma Model ◽  
Dense Medium ◽  
Mean Field Approximation ◽  
Isospin Asymmetry ◽  
Qcd Phase Diagram

The SU(3) Polyakov linear-sigma model (PLSM) in mean-field approximation is utilized in analyzing the chiral condensates [Formula: see text], [Formula: see text], [Formula: see text] and the deconfinement order parameters [Formula: see text], [Formula: see text], at finite isospin asymmetry. The bulk thermodynamics including pressure density, interaction measure, susceptibility and second-order correlations with baryon, strange and electric charge quantum numbers are studied in thermal and dense medium. The PLSM results are confronted to the available lattice quantum chromodynamics (QCD) calculations. The excellent agreement obtained strengthens the reliability of fixing the PLSM parameters and therefore supports further predictions even beyond the scope of the lattice QCD numerical applicability. From the QCD phase structure at finite isospin chemical potential [Formula: see text], we find that the pseudocritical temperatures decrease with the increase in [Formula: see text]. We conclude that the QCD phase structure in [Formula: see text] plane seems to extend the one in [Formula: see text] plane.

scholarly journals Influence of the equation of state on a compact star made of hidden-sector nucleons

2020 ◽  
Vol 2020 (3) ◽  
Author(s):  
Shinji Maedan
Keyword(s):  
Equation Of State ◽  
Cold Dark Matter ◽  
Compact Star ◽  
Mean Field ◽  
Field Approximation ◽  
Compact Stars ◽  
Mean Field Approximation ◽  
Effective Theory ◽  
Hidden Sector ◽  
Two Parameters

Abstract We study a compact star made of degenerate hidden-sector nucleons which will be a candidate for cold dark matter. A hidden sector like quantum chromodynamics is considered, and as the low-energy effective theory we take the (hidden-sector) $ SU(2) $ chiral sigma model including a hidden-sector vector meson. With the mean field approximation, we find that one can treat the equation of state (EOS) of our model analytically by introducing a variable which depends on the Fermi momentum. The EOS is specified by the two parameters $ C'_{\sigma} $, $ C'_{\omega} $, and we discuss how these parameters affect the mass–radius relation for a compact star as well as the EOS. The dependence of the maximum stable mass of compact stars on the parameter $ C'_{\sigma} $ will also be discussed.

Conversion of neutron stars to 2 + 1 flavor Nambu–Jona-Lasinio quark stars as a mechanism for gamma-ray bursts

2017 ◽  
Vol 32 (37) ◽  
pp. 1750209
Author(s):  
Xiao-Yu Shu ◽  
Yong-Feng Huang ◽  
Hong-Shi Zong
Keyword(s):  
Phase Transition ◽  
Gamma Ray ◽  
Chemical Potential ◽  
Proper Time ◽  
Mean Field ◽  
Gamma Ray Bursts ◽  
Compact Stars ◽  
Relativistic Mean Field ◽  
Quark Stars ◽  
Njl Model

The phase transition from a neutron star to a quark star and its relation to gamma-ray bursts are investigated. A new model: the 2 + 1 flavor Nambu–Jona-Lasinio (NJL) model with the method of proper-time regularization (PTR) is utilized for the quark phase; while the Relativistic Mean Field (RMF) theory is used for the hadronic phase. The process of phase transition is studied by considering the chemical potential, paying special attention to the phase transition point and the emergence of strange quark matter. Characteristics of compact stars are illustrated, and the energy release during the phase transition is found to be [Formula: see text] erg.

scholarly journals Properties of a hyperon–quark mixed phase in compact stars

2008 ◽  
Vol 35 (10) ◽  
pp. 104076 ◽  
Author(s):  
Toshiki Maruyama ◽  
Satoshi Chiba ◽  
Hans-Josef Schulze ◽  
Toshitaka Tatsumi
Keyword(s):  
Mixed Phase ◽  
Compact Stars

STELLAR STRUCTURE FROM QCD

2012 ◽  
Vol 18 ◽  
pp. 91-95
Author(s):  
BRUNO FRANZON ◽  
F. S. NAVARRA ◽  
DAVID FOGAÇA
Keyword(s):  
Equation Of State ◽  
Quark Gluon Plasma ◽  
Mean Field ◽  
Gluon Plasma ◽  
Field Approximation ◽  
Compact Stars ◽  
Stellar Structure ◽  
Mean Field Approximation

Using an equation of state based on a mean-field approximation for QCD (MQCD) to describe the cold quark gluon plasma we study the stellar structure of compact stars.

Solid-state reaction synthesis for mixed-phase Eu3+-doped bismuth molybdate and its luminescence properties

2017 ◽  
Vol 31 (26) ◽  
pp. 1750241 ◽  
Author(s):  
Danyang Liang ◽  
Yu Ding ◽  
Nan Wang ◽  
Xiaomeng Cai ◽  
Jia Li ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Phase Structure ◽  
Vital Role ◽  
Mixed Phase ◽  
Spectroscopic Techniques ◽  
Photoluminescence Properties ◽  
X Ray Diffraction ◽  
Bismuth Molybdate ◽  
Bismuth Molybdates

A method for mixed-phase bismuth molybdate doped with Eu[Formula: see text] ions was developed by solid-state reaction assisting with polyvinyl alcohol (PVA). The results of powder X-ray diffraction showed a mixed-phase structure and the microscopical characterization technology revealed the formation process with the addition of PVA. As a structure inducer, the PVA molecules played a vital role in the formation of phase structure. The as-obtained Eu[Formula: see text]-doped bismuth molybdates were also characterized by using different spectroscopic techniques including FTIR and photoluminescence (PL). The results show that doping concentration, PVA addition and calcination temperature affect photoluminescence properties remarkably.

scholarly journals ON A MEAN FIELD APPROXIMATION FOR HIGGS-YUKAWA SYSTEMS

1994 ◽  
Vol 09 (11) ◽  
pp. 983-991 ◽  
Author(s):  
SERGEI V. ZENKIN
Keyword(s):  
Phase Diagram ◽  
Phase Structure ◽  
Finite Lattice ◽  
Mean Field ◽  
Field Approximation ◽  
Ladder Approximation ◽  
Mean Field Approximation ◽  
Ferromagnetic Phase ◽  
Time Dimension ◽  
Infinite Lattice

We discuss the phase structure of a lattice Higgs-Yukawa system in the variational mean field approximation with contributions of fermionic determinant being calculated in a ladder approximation. In particular, we demonstrate that in this approximation the ferromagnetic phase in the Z2 model with naive fermions can appear as an artifact of a finite lattice and that the phase diagram for this model on infinite lattice changes qualitatively at space-time dimension D = 4 compared with those at D > 4.

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