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Neutron-Rich Nuclei in Heaven and Earth

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arxiv nucl-th/0504034 v1 pith:BESASC5Q submitted 2005-04-11 nucl-th astro-phnucl-ex

B.G. Todd-Rutel , J. Piekarewicz This is my paper · ORCID
classification nucl-thastro-phnucl-ex
keywords neutronmsunstarsmodelnucleipropertiessofteningstar
verification ladder T0 review T1 audit T2 compute T3 formal
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An accurately calibrated relativistic parametrization is introduced to compute the ground state properties of finite nuclei, their linear response, and the structure of neutron stars. While similar in spirit to the successful NL3 parameter set, it produces an equation of state that is considerably softer -- both for symmetric nuclear matter and for the symmetry energy. This softening appears to be required for an accurate description of several collective modes having different neutron-to-proton ratios. Among the predictions of this model are a symmetric nuclear-matter incompressibility of K=230 MeV and a neutron skin thickness in 208Pb of Rn-Rp=0.21 fm. Further, the impact of such a softening on the properties of neutron stars is as follows: the model predicts a limiting neutron star mass of Mmax=1.72 Msun, a radius of R=12.66 km for a ``canonical'' M=1.4 Msun neutron star, and no (nucleon) direct Urca cooling in neutrons stars with masses below M=1.3 Msun.

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Cited by 6 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. NNStar: An end-to-end AI agent for nuclear matter and neutron star physics

    nucl-th 2026-07 conditional novelty 6.0 of 10

    NNStar packages the RMF-to-neutron-star pipeline as a portable LLM-agent skill, validated on TM1/NL3/FSU-δ6.7 and demonstrated by an autonomous σ6-extended TM1 fit.

  2. A relativistic mechanism for the enhanced isovector spin-orbit interaction suggested by parity-violating electron scattering experiments

    nucl-th 2025-11 conditional novelty 6.0 of 10

    An enhanced isovector tensor coupling in a covariant density functional fits both PREX-II and CREX weak-charge form-factor differences, acting through a strong isovector spin-orbit interaction.

  3. Medium effects on light clusters from heavy-ion collisions within a relativistic mean-field description

    nucl-th 2026-02 conditional novelty 5.0 of 10

    Bayesian fits to Xe+Sn light-cluster yields show in-medium cluster couplings are temperature dependent, but cannot distinguish scalar-attraction from vector-repulsion pictures.

  4. Exploring the limits of nucleonic metamodelling using different relativistic density functionals

    nucl-th 2025-02 conditional novelty 5.0 of 10

    Comparing two relativistic mean-field model families, the paper shows beta-equilibrium neutron star observations constrain the equation of state but not the proton fraction.

  5. Effects of dark matter and magnetic field on neutron star properties in relativistic mean-field theory: A single-fluid approach

    astro-ph.HE 2026-07 conditional novelty 4.0 of 10

    Fermionic dark matter and strong central magnetic fields both reduce neutron-star maximum mass and radius and lower tidal deformability in single-fluid RMF models, remaining compatible with GW/NICER constraints over t...

  6. The equation of state for neutron stars

    nucl-th 2026-07 unverdicted

    A textbook-style review of the neutron-star equation of state covering the models, experimental and observational constraints, and open questions, with no new result claimed or derived.

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