Rotating neutron stars with quark cores

The rotating neutron-star properties are studied to investigate a phase transition quark matter. density-dependent relativistic mean-field model (DD-RMF) is employed study the hadron matter, while vector-enhanced bag (vBag) used star-matter such as mass, radius, moment of inertia, rotational frequency, Kerr parameter, and other important quantities see their effect on maximum mass neutron star with DD-LZ1 DD-MEX parameter sets found be around $3{M}_{\ensuremath{\bigodot}}$ for pure hadronic decreases $2.6{M}_{\ensuremath{\bigodot}}$ upon transitioning which satisfies recent GW190814 possible constraint, implying that secondary component could fast-rotating hybrid star. For DDV, DDVT, DDVTD sets, satisfy $2{M}_{\ensuremath{\bigodot}}$. inertia calculated various DD-RMF increasing satisfying constraints from measurements. Other also vary constant hence show presence quarks inside stars can allow us constraint these determine proper equation state. Also, theoretical along accurate measurement uniformly may offer some valuable information concerning high-density part