2008/02/23 by B. K. Agrawal, Raj Kumar, Shashi K. Dhiman +1
Earth and Planetary Sciences · Physics and Astronomy · #Astrophysics #Atomic physics #High-pressure geophysics and materials #Hyperon #Nucleon #Physics #Pulsars and Gravitational Waves Research #Stars #Stellar, planetary, and galactic studies #astro-ph #gr-qc #nucl-th
paper · pdf · doi:10.1103/physrevd.77.087301
published as Phys.Rev.D77:087301,2008 · 13 pages, 4 figures, Appearing in Phys. Rev. D
arxiv created 2008/02/23 · openalex publication_date 2008/04/08 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Correlations in the properties of the static compact stars (CSs) and the ones rotating with the highest observed frequency of 1122 Hz are studied using a large set of equations of state (EOSs). These EOSs span various approaches and their chemical composition varies from the nucleons to hyperons and quarks in \ensuremathβ-equilibrium. It is found that the properties of static CS, like the maximum gravitational mass Mmaxstat and radius R1.4stat corresponding to the canonical mass and supramassive or nonsupramassive nature of the CS rotating at 1122 Hz are strongly correlated. In particular, only those EOSs yield the CS rotating at 1122 Hz to be nonsupramassive for which (\fracMmaxstatM_\ensuremath\bigodot)1/2(\frac10 kmR1.4stat)3/2 is greater than unity. A suitable parametric form which can be used to split the Mmaxstat--R1.4stat plane into the regions of different supramassive nature of the CS rotating at 1122 Hz is presented. Currently measured maximum gravitational mass 1.76M_\ensuremath\bigodot of PSR J0437-4715 suggests that the CS rotating at 1122 Hz can be nonsupramassive provided R1.4stat\ensuremath≤12.4 km.