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Microscopic calculations and energy expansions for neutron-rich matter

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arxiv 1310.5627 v2 pith:VZPAVP6Z submitted 2013-10-21 nucl-th astro-ph.SRnucl-ex

classification nucl-thastro-ph.SRnucl-ex
keywords energymatterasymmetriccalculationsneutron-richab-initioagreementapplications
verification ladder T0 review T1 audit T2 compute T3 formal
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We investigate asymmetric nuclear matter with two- and three-nucleon interactions based on chiral effective field theory, where three-body forces are fit only to light nuclei. Focusing on neutron-rich matter, we calculate the energy for different proton fractions and include estimates of the theoretical uncertainty. We use our ab-initio results to test the quadratic expansion around symmetric matter with the symmetry energy term, and confirm its validity for highly asymmetric systems. Our calculations are in remarkable agreement with an empirical parametrization for the energy density. These findings are very useful for astrophysical applications and for developing new equations of state.

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Cited by 4 Pith papers

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

  1. Symmetry Energy Expansion with Strange Dense Matter

    nucl-th 2025-04 unverdicted novelty 7.0 of 10

    A redefinition of the symmetry energy expansion that incorporates finite strangeness consistent with SU(3) flavor symmetry and remains valid beyond typical neutron-star central densities.

  2. A Gaussian Process framework for constraining the nuclear equation of state from microscopic calculations with correlated uncertainties

    nucl-th 2026-08 conditional novelty 6.0 of 10

    GPDiff fits a hierarchical Gaussian process to microscopic asymmetric-matter energies and propagates correlated uncertainties to EOS parameters and neutron-star matter properties.

  3. High-Density Sound Speed and Post-Merger Dynamics

    astro-ph.HE 2026-07 conditional novelty 5.0 of 10

    The slope of the high-density sound-speed curve shifts the post-merger gravitational-wave peak frequency and ejecta mass, and that peak frequency partially correlates with an integrated 'intrinsic tidal response' — bu...

  4. Microscopic constraints for the equation of state and structure of neutron stars: a Bayesian model mixing framework

    nucl-th 2025-05 conditional novelty 5.0 of 10

    A Bayesian model mixing framework using Gaussian processes extends chiral EFT and pQCD constraints to neutron star matter and demonstrates kernel-dependent equation of state and mass-radius predictions.

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