General form of hybrid derivative coupling to study dense nuclear matter and its phase transition to quark matter

1994 ◽  
Vol 50 (2) ◽  
pp. 757-770 ◽  
Author(s):  
Sasabindu Sarkar ◽  
Binay Malakar
Keyword(s):  
Phase Transition ◽  
Nuclear Matter ◽  
Quark Matter ◽  
Derivative Coupling ◽  
Dense Nuclear Matter ◽  
Hybrid Derivative

GENERALIZED HYBRID DERIVATIVE COUPLING MODEL WITH DILATON FIELD TO STUDY PHASE TRANSITION FROM NUCLEAR MATTER TO QUARK MATTER

1999 ◽  
Vol 14 (23) ◽  
pp. 3673-3686
Author(s):  
BINAY MALAKAR ◽  
SASABINDU SARKAR
Keyword(s):  
Phase Transition ◽  
Nuclear Matter ◽  
Quark Matter ◽  
Coupling Model ◽  
Study Phase ◽  
Zero Temperature ◽  
Dilaton Field ◽  
Total Energy Density ◽  
Derivative Coupling ◽  
Hybrid Derivative

The properties of isospin symmetric nuclear matter and its phase transition to quark matter at zero temperature have been investigated in the framework of generalized hybrid derivative coupling model by including the contribution of dilation field. We have compared the results of different models in presence and in absence of dilaton field. The effect of dilaton field becomes prominent as the density increases. The most striking feature of this work is that in presence of dilaton field the vector meson contribution to total energy density is approximately proportional to ρ4/3 instead of ρ2 when the density ρ is extremely high.

HYBRID DERIVATIVE SCALAR COUPLING TO STUDY PROPERTIES OF ASYMMETRIC NUCLEAR MATTER AND ITS PHASE TRANSITION TO QUARK MATTER

1996 ◽  
Vol 11 (38) ◽  
pp. 2977-2992 ◽  
Author(s):  
SASABINDU SARKAR ◽  
BINAY MALAKAR
Keyword(s):  
Phase Transition ◽  
Nuclear Matter ◽  
Thermal Energy ◽  
Quark Matter ◽  
Coupling Model ◽  
Scalar Coupling ◽  
Thermal Pressure ◽  
Asymmetric System ◽  
Asymmetric Nuclear Matter ◽  
Hybrid Derivative

We have studied properties of asymmetric nuclear matter and phase transition from this asymmetric system and also neutron matter to quark matter at zero and nonzero temperatures in the framework of recently proposed hybrid derivative scalar coupling model. We have discussed Hugenholtz-van Hove theorem and studied thermal energy, thermal pressure, symmetry energy and also incompressibility of hot dense asymmetric nuclear matter. Entropy per baryon of asymmetric nuclear matter and quark matter has been evaluated. We have also determined asymmetry dependence of density, energy per baryon of self bound asymmetric quark matter and its incompressibility.

scholarly journals Nuclear phase transition and thermodynamic instabilities in dense nuclear matter

2018 ◽  
Vol 182 ◽  
pp. 03007
Author(s):  
A. Lavagno
Keyword(s):  
Phase Transition ◽  
Nuclear Matter ◽  
Gas Phase ◽  
Degrees Of Freedom ◽  
Baryon Density ◽  
Hadronic Matter ◽  
Mechanical Instability ◽  
Dense Nuclear Matter ◽  
Nuclear Phase ◽  
Matter Phase

We study the presence of thermodynamic instabilities in a nuclear medium at finite temperature and density where nuclear phase transitions can take place. Such a phase transition is characterized by pure hadronic matter with both mechanical instability (fluctuations on the baryon density) that by chemical-diffusive instability (fluctuations on the electric charge concentration). Similarly to the liquid-gas phase transition, the nucleonic and the Δ-matter phase have a different isospin density in the mixed phase. In the liquid-gas phase transition, the process of producing a larger neutron excess in the gas phase is referred to as isospin fractionation. A similar effects can occur in the nucleon-Δ matter phase transition due essentially to a Δ- excess in the Δ-matter phase in asymmetric nuclear matter. In this context we also discuss the relevance of Δ-isobar and hyperon degrees of freedom in the bulk properties of the protoneutron stars at fixed entropy per baryon, in the presence and in the absence of trapped neutrinos.

scholarly journals SU(2) Chiral Sigma Model Study of Phase Transition in Hybrid Stars

2003 ◽  
Vol 18 (30) ◽  
pp. 2135-2145 ◽  
Author(s):  
P. K. Jena ◽  
L. P. Singh
Keyword(s):  
Phase Transition ◽  
Neutron Star ◽  
Nuclear Matter ◽  
Quark Matter ◽  
Sigma Model ◽  
Maximum Mass ◽  
Model Study ◽  
Stable Solutions ◽  
Hybrid Stars ◽  
Matter Component

We use a modified SU(2) chiral sigma model to study nuclear matter component and simple bag model for quark matter constituting a neutron star. We also study the phase transition of nuclear matter to quark matter with the mixed phase characterized by two conserved charges in the interior of highly dense neutron stars. Stable solutions of Tolman–Oppenheimer–Volkoff equations representing hybrid stars are obtained with a maximum mass of 1.67M⊙ and radius around 8.9 km.

ON THE EQUATION OF STATE IN EFFECTIVE QUARK THEORIES

2008 ◽  
Vol 23 (27n30) ◽  
pp. 2477-2480
Author(s):  
W. BENTZ ◽  
S. LAWLEY ◽  
A. W. THOMAS
Keyword(s):  
Phase Transition ◽  
Equation Of State ◽  
Nuclear Matter ◽  
Quark Matter ◽  
Quark Theory

We discuss the saturation mechanism for the nuclear matter equation of state in a chiral effective quark theory. The importance of the scalar polarizability of the nucleon is emphasized. The phase transition to color superconducting quark matter is also discussed.

NEW ASPECTS ON GRAVITATIONAL WAVE EMISSION BY NEUTRON STARS

2004 ◽  
Vol 13 (07) ◽  
pp. 1293-1296 ◽  
Author(s):  
GUILHERME F. MARRANGHELLO ◽  
CÉSAR A. Z. VASCONCELLOS ◽  
JOSÉ A. de FREITAS PACHECO ◽  
MANFRED DILLIG ◽  
HÉLIO T. COELHO
Keyword(s):  
Phase Transition ◽  
Equation Of State ◽  
Neutron Stars ◽  
Nuclear Matter ◽  
Gravitational Wave ◽  
Gravitational Waves ◽  
Quark Matter ◽  
Inner Core ◽  
Compact Objects ◽  
Wave Emission

We discuss, in this work, new aspects related to the emission of gravitational waves by neutron stars, which undergo a phase transition, from nuclear to quark matter, in its inner core. Such a phase transition would liberate around 1052–53 erg of energy in the form of gravitational waves which, if detected, may shed some light in the structure of these compact objects and provide new insights on the equation of state of nuclear matter.

The L-G Phase Transition and the Nucleon–Nucleon Interaction Potential within QHD-I Model

2003 ◽  
Vol 18 (29) ◽  
pp. 2029-2037
Author(s):  
Jin Meng ◽  
Jiarong Li ◽  
Jisheng Chen
Keyword(s):  
Phase Transition ◽  
Nuclear Matter ◽  
Interaction Potential ◽  
Yukawa Potential ◽  
Nucleon Nucleon ◽  
Nucleon Interaction ◽  
Nucleon System ◽  
Debye Mass ◽  
Dense Nuclear Matter ◽  
Nucleon Nucleon Interaction

The nucleon–nucleon interaction potential in hot/dense nuclear matter is studied within the QHD-I model. We find that a Yukawa potential, which contains attractive and repulsive terms, acting between nucleons is modified by the variation of the Debye mass. In particular, a nucleon system described by this Yukawa potential will be unbound at some critical T and μ. The critical point is very close to that of the L-G phase transition given in the literatures.

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