Estimating Compressibility from Maximal-mass Compact Star Observations

TL;DR

This paper estimates nuclear matter properties like nucleon Landau mass and compressibility by analyzing recent pulsar mass observations within an extended $\sigma$-$\omega$ model, linking astrophysical data to nuclear physics parameters.

Contribution

It introduces a method to infer nuclear matter properties from maximal-mass compact star observations using the extended $\sigma$-$\omega$ model, providing new estimates for key nuclear parameters.

Findings

Estimated nucleon Landau mass: 776.0^{+38.5}_{-84.9} MeV

Estimated nuclear compressibility: 242.7^{+57.2}_{-28.0}

Linked pulsar mass data to nuclear matter properties

Abstract

We investigated recent observation data of pulsar masses of PSR J0740$+$6620, PSR J0348$+$0432, and PSR J1614$-$2230 based on the extended $\sigma$-$\omega$ 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 $m_{L} = 776.0^{+38.5}_{-84.9}$~MeV and $K=242.7^{+57.2 }_{-28.0}$, respectively.