QUARK CONFINEMENT AND THE PROPERTIES OF QUARK MATTER

2010 ◽  
Vol 19 (08n09) ◽  
pp. 1837-1842 ◽  
Author(s):  
G. X. PENG ◽  
S. W. CHEN ◽  
Q. CHANG ◽  
H. H. TANG
Keyword(s):  
Energy Density ◽  
Quark Matter ◽  
Second Derivative ◽  
Velocity Of Sound ◽  
Quark Confinement ◽  
Bag Model ◽  
Density Dependent ◽  
Quark Masses ◽  
Mit Bag Model ◽  
Density Behavior

The properties of two-flavor quark matter are investigated with a model which incorporates the confinement by density-dependent quark masses (CDDM). The results are compared with those in the conventional MIT bag model. It is found that the density behavior of quark matter in the two models are significantly different. Specially, the second derivative of the energy density can be negative in the CDDM while that in the bag model is always positive. This makes the velocity of sound very different in both models.

scholarly journals Interface effects of strange quark matter with density dependent quark masses

2018 ◽  
Vol 98 (3) ◽  
Author(s):  
Cheng-Jun Xia ◽  
Guang-Xiong Peng ◽  
Ting-Ting Sun ◽  
Wan-Lei Guo ◽  
Ding-Hui Lu ◽  
...  
Keyword(s):  
Quark Matter ◽  
Strange Quark ◽  
Strange Quark Matter ◽  
Density Dependent ◽  
Quark Masses ◽  
Interface Effects

scholarly journals QUARK STARS AND QUANTUM-MAGNETICALLY INDUCED COLLAPSE

2005 ◽  
Vol 14 (11) ◽  
pp. 1959-1969 ◽  
Author(s):  
A. PÉREZ MARTÍNEZ ◽  
H. PÉREZ ROJAS ◽  
H. J. MOSQUERA CUESTA ◽  
M. BOLIGAN ◽  
M. G. ORSARIA
Keyword(s):  
Neutron Stars ◽  
Magnetic Moment ◽  
Anomalous Magnetic Moment ◽  
Quark Matter ◽  
Strange Quark ◽  
Vacuum Energy Density ◽  
Bag Model ◽  
X Ray ◽  
Quark Stars ◽  
Mit Bag Model

Quark matter is expected to exist in the interior of compact stellar objects as neutron stars or even the more exotic strange stars, based on the Bodmer–Witten conjecture. Bare strange quark stars and (normal) strange quark-matter stars, those possessing a baryon (electron-supported) crust, are hypothesized as good candidates to explain the properties of a set of peculiar stellar sources such as the enigmatic X-ray source RX J1856.5-3754, some pulsars such as PSR B1828-11 and PSR B1642-03, and the anomalous X-ray pulsars and soft γ-ray repeaters. In the MIT bag model, quarks are treated as a degenerate Fermi gas confined to a region of space having a vacuum energy density B bag (the Bag constant). In this note, we modify the MIT bag model by including the electromagnetic interaction. We also show that this version of the MIT model implies the anisotropy of the bag pressure due to the presence of the magnetic field. The equations of state of the degenerate quarks gases are studied in the presence of ultra strong magnetic fields. The behavior of a system made up of quarks having (or not) anomalous magnetic moment is reviewed. A structural instability is found, which is related to the anisotropic nature of the pressures in this highly magnetized matter. The conditions for the collapse of this system are obtained and compared to a previous model of neutron stars that is built on a neutron gas having anomalous magnetic moment.

scholarly journals Quark matter revisited with non-extensive MIT bag model

2017 ◽  
Vol 53 (10) ◽  
Author(s):  
Pedro H. G. Cardoso ◽  
Tiago Nunes da Silva ◽  
Airton Deppman ◽  
Débora P. Menezes
Keyword(s):  
Quark Matter ◽  
Bag Model ◽  
Mit Bag Model

scholarly journals STRUCTURE OF NEUTRON STAR WITH A QUARK CORE

2006 ◽  
Vol 21 (28n29) ◽  
pp. 5991-6001 ◽  
Author(s):  
G. H. BORDBAR ◽  
M. BIGDELI ◽  
T. YAZDIZADEH
Keyword(s):  
Neutron Star ◽  
Equation Of State ◽  
Quark Matter ◽  
Bag Model ◽  
Quark Core ◽  
Mit Bag Model ◽  
Bag Constant

The equation of state of deconfined quark matter within the MIT bag model is calculated. This equation of state is used to compute the structure of a neutron star with quark core. It is found that the limiting mass of the neutron star is affected considerably by this modification of the equation of state. Calculations are carried out for different choices of the bag constant.

scholarly journals Reduction of the Mass of the Proto-Quark Star during Cooling

Particles ◽  
2021 ◽  
Vol 4 (1) ◽  
pp. 37-44
Author(s):  
Gevorg Hajyan
Keyword(s):  
Quark Matter ◽  
Finite Temperature ◽  
Supernova Explosion ◽  
Neutrino Emission ◽  
Quark Star ◽  
Bag Model ◽  
Quark Stars ◽  
Mit Bag Model

The integral parameters (mass, radius) of hot proto-quark stars that are formed in supernova explosion are studied. We use the MIT bag model to determine the pressure of up-down and strage quark matter at finite temperature and in the regime where neutrinos are trapped. It is shown that such stars are heated to temperatures of the order of tens of MeV. The maximum possible values of the central temperatures of these stars are determined. It is shown that the energy of neutrinos that are emitted from proto-quark stars is of the order of 250÷300 MeV. Once formed, the proto-quark stars cool by neutrino emission, which leads to a decrease in the mass of these stars by about 0.16–0.25 M⊙ for stars with the rest masses that are in the range Mb=1.22−1.62M⊙.

scholarly journals EQUATION OF STATE FOR NUCLEAR MATTER BASED ON DENSITY DEPENDENT EFFECTIVE INTERACTION

2005 ◽  
Vol 14 (05) ◽  
pp. 739-749 ◽  
Author(s):  
D. N. BASU
Keyword(s):  
Experimental Data ◽  
Equation Of State ◽  
Energy Density ◽  
Nuclear Matter ◽  
Effective Interaction ◽  
Velocity Of Sound ◽  
Density Dependent ◽  
Nuclear Incompressibility ◽  
Unified Description ◽  
Good Agreement

An interesting method of obtaining the equation of state for nuclear matter, from a density dependent M3Y interaction, by minimizing the energy per nucleon is described. The density dependence parameters of the interaction are obtained by reproducing the saturation energy per nucleon and the saturation density of spin and isospin symmetric cold infinite nuclear matter. The nuclear matter equation of state thus obtained is then used to calculate the pressure, energy density, nuclear incompressibility and velocity of sound in nuclear medium. The results obtained are in good agreement with experimental data and provide a unified description of radioactivity, scattering and nuclear matter.

scholarly journals Strange Star Equations of State Revisited

2005 ◽  
Vol 22 (4) ◽  
pp. 292-297 ◽  
Author(s):  
Debora P. Menezes ◽  
Don B. Melrose
Keyword(s):  
Neutron Stars ◽  
Quark Matter ◽  
Equations Of State ◽  
Bag Model ◽  
Strange Stars ◽  
Strange Matter ◽  
Strong Force ◽  
Mit Bag Model ◽  
Central Energy ◽  
Weakly Dependent

AbstractMotivated by recent suggestions that strange stars can be responsible for glitches and other observational features of pulsars, we review some possible equations of state and their implications for models of neutron, hybrid, and strange stars. We consider the MIT bag model and also strange matter in the colour–flavour locked phase. The central energy densities for strange stars are higher than the central densities of ordinary neutron stars. Strange stars are bound by the strong force and so can also rotate much faster than neutron stars. These results are only weakly dependent on the model used for the quark matter. If just one of the existing mass-to-radius ratio constraint is valid, most neutron stars equations of state are ruled out, but all the strange stars equations of state presented in this work remain consistent with the constraint.

THE STRUCTURE OF NEUTRON STAR BY USING THE QUARK-MESON COUPLING MODEL

2011 ◽  
Vol 01 ◽  
pp. 177-182
Author(s):  
C. Y. RYU ◽  
MYUNG-KI CHEOUN
Keyword(s):  
Neutron Star ◽  
Quark Matter ◽  
Coupling Model ◽  
Bag Model ◽  
Kaon Condensation ◽  
Meson Coupling ◽  
Mit Bag Model

We investigate the structure of neutron star within the framework of the quark-meson coupling model, considering hyperons and kaon condensation. In order to compare the EoS with that from quark matter, the MIT bag model is used. We calculate the mass and radius of a neutron star by using Tolman-Oppenheimer-Volkov equations.

scholarly journals Quark cores in extensions of the MIT Bag model

2021 ◽  
Author(s):  
Salil Joshi ◽  
Sovan Sau ◽  
Soma Sanyal
Keyword(s):  
Bag Model ◽  
Mit Bag Model
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