We investigate the speed of sound and polytropic index quantum chromodynamics (QCD) matter in full phase diagram based on a three-flavor Polyakov-looped Nambu-Jona-Lasinio (PNJL) model. The isothermal adiabatic cases all have dip structure at low chemical potential side chiral transition boundary, these quantities reach their global minimum values critical end point (CEP) but are not completely zero, where lightly greater than those isothermal. Different from sound, rapidly form peak after...

We explore the possibility of a structured hadron-quark mixed phase forming in interior neutron stars. The quark-meson coupling (QMC) model, which explicitly incorporates internal quark structure nucleon, is employed to describe hadronic phase, while described by same bag model as one used QMC framework, so keep consistency between two coexisting phases. analyze effect appearance pasta phases on neutron-star properties. also discuss influence nuclear symmetry energy and constant $B$ matter...

In this work, we explore the properties of isospin asymmetric quark matter in stars (QSs). The chemical potential, asymmetry, symmetry energy, equation state (EOS) strange (SQM), and maximum mass QSs are also studied by using different phenomenological models. Our results indicate that parameter space models for energy EOS star can be reduced considering recent mass-radius estimates PSR $\mathrm{J}0740+6620$, $\mathrm{J}0030+0451$, 4U 1702-429, central compact within supernova remnant HESS J1731-347.

Abstract In this study, we extend the MIT bag model by incorporating vector interaction among quarks and introducing a density-dependent pressure. Then proceed to investigate thermodynamic properties of strange quark matter (SQM) pure up-down (udQM) in stars (QSs). Our findings demonstrate that density dependence pressure $$B(n_b)$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>B</mml:mi> <mml:mo>(</mml:mo> <mml:msub> <mml:mi>n</mml:mi> <mml:mi>b</mml:mi>...

Abstract We investigate the properties of hybrid star and mixed phase core to explore radius ratio in star. In context observed massive neutron stars (NSs), we examine internal structure, transitions, impacts equation state (EOS) maximum stiffness changes EOS during hadron-quark transition within stars. The relativistic mean-field (RMF) model is used describe hadronic matter, while represent quark Nambu–Jona–Lasinio (NJL) applied. strength vector coupling which delays onset density reduces...

Abstract In this work, we extend the quasiparticle model to include chemical potential dependence of coupling constant g and consider density-dependent bag $$B_m$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>B</mml:mi> <mml:mi>m</mml:mi> </mml:msub> </mml:math> in order satisfy asymptotic freedom feature. By satisfying absolutely stable condition at zero temperature, draw stability region strange quark matter (SQM) describe recently discovered pulsars PSR...

Abstract We investigate the thermodynamical properties of color-flavor locked (CFL) quark matter at zero temperature, finite and strong magnetic field by using quasiparticle model. find that considering CFL phase can significantly change equation state (EOS) as well in stars (QSs) temperature or under within In particular, our results have shown we provide large QSs from model satisfying both upper limit $$\Lambda _{1.4}&lt;800$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">...

The structured hadron-quark mixed phase, known as the pasta is expected to appear in core of massive neutron stars. Motivated by recent advances astrophysical observations, we explore possibility appearance quarks inside stars and check its compatibility with current constraints. We investigate properties phases their influences on equation state (EOS) for In this work, extend energy minimization (EM) method describe where surface Coulomb contributions are included procedure. By allowing...

Machine learning methods have recently gained interest in the complexity of nuclear mass prediction. According to previous studies, we propose a continuous Bayesian probability (CBP) classifier combined with model averaging (BMA) refine descriptions sophisticated models. In CBP method, masses are considered variables generate prior and conditional density functions (PDFs), posterior PDFs determined by formula. The global optimizations extrapolating analyses exhibit impressive improvements....

We investigate the properties of quark matter and stars (QSs) within SU(3) Nambu-Jona-Lasinio model, considering effects axion fields vector interactions. Under assumption absolutely stable condition strange matter, we find that including interactions significantly influences equation state, constituent mass, isospin asymmetry for u d quarks, fractions, sound velocity, maximum mass QSs. In particular, our results indicate central baryon density star polytropic index γ both decrease with...

We investigate the speed of sound and polytropic index quantum chromodynamics (QCD) matter in full phase diagram based on a 3-flavor Polyakov-looped Nambu-Jona-Lasinio (pNJL) model. The isothermal adiabatic cases all have dip structure at low chemical potential side chiral transition boundary, these quantities reach their global minimum values critical endpoint (CEP) but are not completely zero, where lightly greater than those isothermal. Different from sound, also exists peak around...

In the context of observed massive neutron stars (NSs), we examine internal structure, phase transitions, and impacts equation state (EOS) in maximum NSs. We investigate stiffness changes EOS during hadron-quark transition within The relativistic mean-field (RMF) model RMF with a density-dependent isovector coupling, known as RMFL model, are used to describe hadronic matter, while represent quark Nambu-Jona-Lasinio (NJL) is applied. explore strength vector coupling which delayed onset...