"Core States of Neutron Stars from Anatomizing Their Scaled Structure E" by Bao-Jun Cai, Bao-An Li et al.
 

Author(s)/Creator(s)

Bao-Jun Cai
Bao-An Li
Zen Zhang

Publication Title

The Astrophysical Journal

Document Type

Article

Abstract/Description

Given an Equation of State (EOS) for neutron star (NS) matter, there is a unique mass–radius sequence characterized by a maximum mass MNS max at radius Rmax. We first show analytically that the MNS max and Rmax scale linearly with two different combinations of the NS central pressure Pc and energy densityεc, by dissecting perturbatively the dimension less Tolman–Oppenheimer–Volkoff (TOV) equations governing NS internal variables. The scaling relations are then verified via 87 widely used and rather diverse phenomenological as well as 17 microscopic NS EOSs with/without considering hadron–quark phase transitions and hyperons, by solving numerically the original TOV equations. The EOS of the densest NS matter allowed before it collapses into a black hole is then obtained. Using the universal MNS max and Rmax scalings and Neutron Star Interior Composition Explorer and XMM-Newton mass–radius observational data for PSR J0740+6620, a very narrow constraining band on the NS central EOS is extracted directly from the data for the first time, without using any specific input EOS model.

Department

Physics and Astronomy

DOI

10.3847/1538-4357/acdef0

Volume

952

Issue

2

ISSN

1538-4357

Date

8-1-2023

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