2020/04/17 by Péter Pósfay, G. G. Barnaföldi, Pósfay, Péter +4 · 1 citation
Physics and Astronomy · Earth and Planetary Sciences · #Pulsars and Gravitational Waves Research #Geophysics and Gravity Measurements #Gamma-ray bursts and supernovae
paper · pdf · doi:10.48550/arxiv.2004.08230
Recent NICER observation data on PSR J0030+0451 has recently added a unique\nmass-radius constraint on the properties of the superdense nuclear matter\nexisting in the interior of compact stars. Such a macroscopic data restrict\nfurther the microscopical models, elementary interactions, and their\nparameters, however, with reasonable margin because of the masquarade problem.\nHere our goal is to identify the origin and quantify the magnitude of the\ntheoretical uncertainties of the nuclear matter models.\n A detailed study on the effect of different interaction terms and the nuclear\nparameter values in the Lagrangian of the extended \σ-\ω model is\npresented here. The equation of state was inserted to the\nTolman--Oppenheimer--Volkoff equation and observable parameters of the neutron\nstar were calculated.\n We identified, that the optimal Landau effective mass is the most relevant\nphysical parameter modifying the macroscopic observable values. Moreover, the\ncompressibility and symmetry energy terms just generate one-one order of\nmagnitude smaller effect to this, respectively. We calculated the linear\nrelations between the maximal mass of a compact star and these microscopic\nnuclear parameter values within the physical relevant parameters range. Based\non the mass observational data we estimated the magnitude of the radii of PSR\nJ1614-2230, PSR J0348+0432, and PSR J0740+6620 including theoretical\nuncertainties arising from the models' interaction terms and their parameter\nvalues choices.\n