STABILITY OF STRANGELETS IN THE QUARK MASS DENSITY- AND TEMPERATURE-DEPENDENT MODEL

2003 ◽  
Vol 18 (02n06) ◽  
pp. 143-146 ◽  
Author(s):  
YUN ZHANG ◽  
RU-KENG SU
Keyword(s):  
Finite Temperature ◽  
Quark Mass ◽  
Mass Density ◽  
Baryon Number ◽  
Temperature Dependent ◽  
Dependent Model ◽  
The Stability ◽  
Temperature Dependent Model

By means of the quark mass density- and temperature-dependent model, we have investigated the stability of strangelets at finite temperature. We have found two stable strangelets for the baryon number A equal to five and the temperature 20MeV.

scholarly journals SLOWLY ROTATING PROTO STRANGE STARS IN QUARK MASS DENSITY- AND TEMPERATURE-DEPENDENT MODEL

2005 ◽  
Vol 20 (32) ◽  
pp. 7547-7565 ◽  
Author(s):  
JIANYONG SHEN ◽  
YUN ZHANG ◽  
BIN WANG ◽  
RU-KENG SU
Keyword(s):  
Quark Mass ◽  
Mass Density ◽  
Moment Of Inertia ◽  
Strange Star ◽  
Horizontal Branch ◽  
Temperature Dependent ◽  
Frame Dragging ◽  
Dependent Model ◽  
The Moment ◽  
Temperature Dependent Model

Employing the Quark Mass Density- and temperature-dependent model and the Hartle's method, we have studied the slowly rotating strange star with uniform angular velocity. The mass–radius relation, the moment of inertia and the frame dragging for different frequencies are given. We found that we cannot use the strange star to solve the challenges of Stella and Vietri for the horizontal branch oscillations and the moment of inertia I45/(M/Ms)>2.3. Furthermore, we extended the Hartle's method to study the differential rotating strange star and found that the differential rotation is an effective way to get massive strange star.

scholarly journals COLOR-FLAVOR LOCKED STRANGELETS IN A QUARK MASS DENSITY-DEPENDENT MODEL

2007 ◽  
Vol 22 (08n09) ◽  
pp. 1649-1661 ◽  
Author(s):  
X. J. WEN ◽  
G. X. PENG ◽  
P. N. SHEN
Keyword(s):  
Quark Mass ◽  
Mass Density ◽  
Baryon Number ◽  
The Other ◽  
Model Parameters ◽  
Three Solutions ◽  
Density Dependent ◽  
System Equations ◽  
Dependent Model ◽  
Positively Charged

The color-flavor locked (CFL) phase of strangelets is investigated in a quark mass density-dependent model. Parameters are determined by stability arguments. It is concluded that three solutions to the system equations can be found, corresponding, respectively, to positively charged, negatively charged, and nearly neutral CFL strangelets. The charge to baryon number of the positively charged strangelets is smaller than the previous result, while the charge of the negatively charged strangelets is nearly proportional in magnitude to the cubic-root of the baryon number. However, the positively charged strangelets are more stable compared to the other two solutions.

THE PROPERTIES OF STRANGE STARS IN THE QUARK MASS– DENSITY–DEPENDENT MODEL

1998 ◽  
Vol 07 (01) ◽  
pp. 29-48 ◽  
Author(s):  
O. G. BENVENUTO ◽  
G. LUGONES
Keyword(s):  
Equation Of State ◽  
Quark Mass ◽  
Mass Density ◽  
Baryon Number ◽  
Moment Of Inertia ◽  
Bag Model ◽  
Strange Stars ◽  
Strange Matter ◽  
Mit Bag Model ◽  
Dependent Model

We study the general properties of compact objects made up of strange matter in the framework of a new equation of state in which the quark masses are parametrized as functions of the baryon density, so that they are heavy (light) at low (high) densities. This has been called the "quark mass-density-dependent model." In this approximation, the strange matter equation of state is rather similar to the corresponding to the MIT Bag Model, but it is significantly stiffer at low densities. Such a property modifies the structure of strange stars in a sizeable way. In this framework, we calculate the structure of strange stars (mass, radius, central density, gravitational redshift, moment of inertia, and total baryon number) finding that the resulting structures are rather similar to those obtained in the MIT Bag model, although some important differences appear. Comparing to the standard bagged case (with a bag constant in the range of B = 60 - 80 MeV fm-3), we find that these objects may be more massive and may show gravitational redshifts larger (up to ≈ 10%) than in the bag case. The moment of inertia and total baryon number may be larger than in the bagged case up to a factor of three. We also calculate the first three radial pulsation modes of these objects, finding that the relation of period vs. gravitational redshift is rather similar to the bag case. Also, we present an analytical treatment for such modes in the low-mass strange stars regime, which is in reasonable agreement with the numerical results.

scholarly journals A QUARK MESON COUPLING MODEL WITH DENSITY- AND TEMPERATURE-DEPENDENT QUARK MASSES

2005 ◽  
Vol 20 (08n09) ◽  
pp. 1931-1934 ◽  
Author(s):  
WEI LIANG QIAN ◽  
RU-KENG SU
Keyword(s):  
Nuclear Matter ◽  
Mass Density ◽  
Coupling Model ◽  
Temperature Dependent ◽  
Quark Masses ◽  
Saturation Properties ◽  
Meson Coupling ◽  
Dependent Model ◽  
Temperature Dependent Model ◽  
Dynamic Formation

Based on the quark mass density- and temperature- dependent model we suggest a model for nuclear matter where the meson field is introduced to be directly coupled to the quarks. The dynamic formation of the nucleon bag, the saturation properties of nuclear matter as well as equation of state for this model are studies.

Water, Water, Here and There

2018 ◽  
Author(s):  
Steven E. Vigdor
Keyword(s):  
Quark Mass ◽  
Mass Difference ◽  
Baryon Number ◽  
Electroweak Phase Transition ◽  
Hydrogen Burning ◽  
Quark Masses ◽  
Grand Unified Theories ◽  
Down Quark ◽  
Unified Theories ◽  
The Stability

Chapter 4 deals with the stability of the proton, hence of hydrogen, and how to reconcile that stability with the baryon number nonconservation (or baryon conservation) needed to establish a matter–antimatter imbalance in the infant universe. Sakharov’s three conditions for establishing a matter–antimatter imbalance are presented. Grand unified theories and experimental searches for proton decay are described. The concept of spontaneous symmetry breaking is introduced in describing the electroweak phase transition in the infant universe. That transition is treated as the potential site for introducing the imbalance between quarks and antiquarks, via either baryogenesis or leptogenesis models. The up–down quark mass difference is presented as essential for providing the stability of hydrogen and of the deuteron, which serves as a crucial stepping stone in stellar hydrogen-burning reactions that generate the energy and elements needed for life. Constraints on quark masses from lattice QCD calculations and violations of chiral symmetry are discussed.

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