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Equation-of-state-insensitive measure of neutron star stiffness

Saes, Jayana A ; Mendes, Raissa F P

arXiv.org, 2022-08

Ithaca: Cornell University Library, arXiv.org

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  • Título:
    Equation-of-state-insensitive measure of neutron star stiffness
  • Autor: Saes, Jayana A ; Mendes, Raissa F P
  • Assuntos: Equations of state ; Flux density ; Formability ; Moments of inertia ; Neutron stars ; Neutrons ; Nuclear matter ; Physics - General Relativity and Quantum Cosmology ; Physics - High Energy Astrophysical Phenomena ; Relativity ; Stiffness
  • É parte de: arXiv.org, 2022-08
  • Descrição: Universal relations (i.e., insensitive to the equation of state) between macroscopic properties of neutron stars have proven useful for a variety of applications -- from providing a direct means to extract observables from data to breaking degeneracies that hinder tests of general relativity. Similarly, equation-of-state-insensitive relations directly connecting macroscopic and microscopic properties of neutron stars can potentially provide a clean window into the behavior of nuclear matter. In this work, we uncover a tight correlation between certain macroscopic properties of a neutron star - its compactness \(C\), moment of inertia \(\bar{I}\) and tidal deformability \(\bar{\Lambda}\) - and the ratio \(\alpha_c \equiv p_c/\epsilon_c\) of central pressure to central energy density, which can be interpreted as a mean notion of the stiffness of nuclear matter inside that object. We describe interesting properties of this stiffness measure, quantify the (approximate) universality of the \(\alpha_c - C/\bar{I}/\bar{\Lambda}\) relations, and explore its consequences in the face of recent and future neutron star observations.
  • Editor: Ithaca: Cornell University Library, arXiv.org
  • Idioma: Inglês
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