Energy and pressure in neutron matter: current status of ab initio predictions vs. empirical constraints

ORAL

Abstract

Modern theoretical predictions of the neutron matter equation of state and the symmetry energy are timely. Recent and planned experiments aim at extracting constraints on the density dependence of these quantities, which is of paramount importance for a number of nuclear and astrophysical systems. We discuss ab initio predictions in relation to recent empirical information. We emphasize and demonstrate that free-space NN data pose stringent constraints on the density dependence of the neutron matter equation of state and thus the slope of the symmetry energy at saturation, which we find to be extremely sensitive to the isovector component of the NN interaction through the 1S0 partial wave.

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Publication: F. Sammarruca, "The Symmetry Energy: Current Status of Ab Initio Predictions vs. Empirical Constraints," submitted to Symmetry, Special issue on "The symmetry energy in nuclear physics and nuclear astrophysics." arXiv:2212.13304v1 [nucl-th]

F. Sammarruca, "Neutron skin systematics from microscopic equations of state," Phys. Rev. C 104, 064312(2022).

F. Sammarruca and Randy Millerson, "The equation of state of neutron-rich matter at fourth order of chiral effective field theory and the radius of a medium-mass neutron star," Universe 8, 133 (2022), Special Issue on "Gravitational Waves as a New Probe for Astronomy and Fundamental Physics."

F. Sammarruca and Randy Millerson, "Overview of symmetric nuclear matter properties from chiral interactions up to fourth order of the chiral expansion," Phys. Rev. C 104, 064312 (2021).

F. Sammarruca and Randy Millerson, "Analysis of the neutron matter equation of state and the symmetry energy to fourth order of chiral effective field theory," Phys. Rev. C 104, 034308 (2021).

Presenters

  • Francesca Sammarruca

    University of Idaho

Authors

  • Francesca Sammarruca

    University of Idaho