Estimating compressibility from maximal-mass compact star observations

Abstract

We investigated recent observation data of pulsar masses of PSR J0740+6620, PSR J0348+0432, and PSR J1614−2230 based on the extended σ-ω model. We assumed that these pulsars are maximal mass compact star, which suggest that the core approximation can be applied. Using the linear relations between the microscopic and macroscopic parameters of neutron stars suggested by this model, we estimated the values of the nucleon Landau mass and nuclear compressibility mL=776.0−84.9+38.5 MeV and K=242.7−28.0+57.2 MeV, respectively.

Estimating Microscopic Nuclear Data by Compact Star Observations

“…Using these derived equations and pulsar observation data we obtained the optimal Landau masses, and compressibility values for each compact object in Table 1. We also determined the average of Landau masses m L = 752.46 +49.1 −42.5 MeV and mean compressibility K = 261.7 +57.2 −28.0 MeV, which agrees well with the saturated nuclear matter data and with our recent works [2,3]. In contrary, calculations of R maxM by eqs.…”

“…are also plotted with color markers, where the error bars include both theoretical uncertainties from the phenomenological approach and errors from the astrophysical observation. Our results agree well with our previous results [1,3] and also with a Bayesian analysis carried out on this extended σ-ω model [2,3].…”

“…Macroscopical compact star observation parameters and microscopical superdenes nuclear matter properties has been formulated in Refs. [1][2][3]. This has been validated in the liu of the recent NICER [6] and NICER+XMM-Newton [5] data.…”

“…Ordering in the strengths of these properties variation has been also obtained in general for the maximum mass star (MMS): ∆M max (δm L ) 10× > ∆M max (δK). Landau effective mass values we already determined by former analysis [2,3]. We would like to investigate the compressibilty K by using recent maximal-mass pulsar observation data from PSR J0740+6620 [4][5][6], PSR J0348+0432 [7], and PSR J1614−2230 [8].…”

Estimating Microscopic Nuclear Data by Compact Star Observations

“…Ordering in the strengths of these properties variation has been also obtained in general for the maximum mass star (MMS): ∆M max (δm L ) 10× > ∆M max (δK). Landau effective mass values we already determined by former analysis [2,3]. We would like to investigate the compressibilty K by using recent maximal-mass pulsar observation data from PSR J0740+6620 [4][5][6], PSR J0348+0432 [7], and PSR J1614−2230 [8].…”