Imprints of High-Density Nuclear Symmetry Energy on Crustal Fraction of Neutron Star Moment of Inertia

Zhang, Nai-Bo; Li, Bao-An

doi:10.3390/particles8010012

Imprints of High-Density Nuclear Symmetry Energy on Crustal Fraction of Neutron Star Moment of Inertia

Journal Article · Fri Feb 07 00:00:00 EST 2025 · Particles

DOI:https://doi.org/10.3390/particles8010012· OSTI ID:2513563

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The density dependence of nuclear symmetry energy Esym(ρ) remains the most uncertain aspect of the equation of state (EOS) of supradense neutron-rich nucleonic matter. Utilizing an isospin-dependent parameterization of the nuclear EOS, we investigate the implications of the observational crustal fraction of the neutron star (NS) moment of inertia ΔI/I for the Esym(ρ). We find that symmetry energy parameters significantly influence the ΔI/I, while the EOS of symmetric nuclear matter has a negligible effect. In particular, an increase in the slope L and skewness Jsym of symmetry energy results in a larger ΔI/I, whereas an increase in the curvature Ksym leads to a reduction in ΔI/I. Moreover, the ΔI/I is shown to have the potential for setting a lower limit of symmetry energy at densities exceeding 3ρ0, particularly when L is constrained to values less than 60 MeV, thereby enhancing our understanding of supradense NS matter.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0009971; SC0013702

OSTI ID:: 2513563

Journal Information:: Particles, Journal Name: Particles Journal Issue: 1 Vol. 8; ISSN PARTE7; ISSN 2571-712X

Publisher:: MDPI AGCopyright Statement

Country of Publication:: Switzerland

Language:: English

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