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.

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.

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.

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