2005/07/31 by B. D. Lackey, Benjamin D. Lackey, Mohit Nayyar +2 · 5 citations
Earth and Planetary Sciences · Physics and Astronomy · #Astrophysics #Baryon #Equation of state #Gamma-ray bursts and supernovae #Gravitational redshift #Gravitational wave #High-pressure geophysics and materials #Hyperon #Neutron #Neutron star #Nuclear physics #Physics #Pulsars and Gravitational Waves Research #Quantum mechanics #RADIUS #Redshift #Stars #astro-ph #gr-qc
paper · pdf · doi:10.1103/physrevd.73.024021
published as Phys.Rev.D73:024021,2006 · 8 pages, 5 figures; corrected error in equation three, corrected minor typos, new tables of equations of state added; final version as appearing in PRD
openalex publication_date 2006/01/23 · arxiv created 2006/02/15 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The possibility that neutron stars may contain substantial hyperon populations has important implications for neutron-star cooling and, through bulk viscosity, the viability of the r-modes of accreting neutron stars as sources of persistent gravitational waves. In conjunction with laboratory measurements of hypernuclei, astronomical observations were used by Glendenning and Moszkowski [Phys. Rev. Lett. 67, 2414 (1991)] to constrain the properties of hyperonic equations of state within the framework of relativistic mean-field theory. We revisit the problem, incorporating recent measurements of high neutron-star masses and a gravitational redshift. We find that only the stiffest of the relativistic hyperonic equations of state commonly used in the literature is compatible with the redshift. However, it is possible to construct stiffer equations of state within the same framework which produce the observed redshift while satisfying the experimental constraints on hypernuclei, and we do this. The stiffness parameter that most affects the redshift is not the incompressibility but rather the hyperon coupling. Nonrelativistic potential-based equations of state with hyperons are not constrained by the redshift, primarily due to a smaller stellar radius.