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Equation of state and Fermi liquid properties of dense matter based on chiral effective field theory interactions

F. Alp1,2,3,*, Y. Dietz1,2,†, K. Hebeler1,2,3,‡, and A. Schwenk1,2,3,§

  • *Contact author: faruk_musa.alp@tu-darmstadt.de
  • †Contact author: yannick.dietz@tu-darmstadt.de
  • ‡Contact author: kai.hebeler@physik.tu-darmstadt.de
  • §Contact author: schwenk@physik.tu-darmstadt.de
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Phys. Rev. C 112, 055802 – Published 19 November, 2025

DOI: https://doi.org/10.1103/ls3l-dn1y

Abstract

We present results for the equation of state of symmetric nuclear matter and pure neutron matter obtained in many-body-perturbation theory (MBPT) up to third order, based on various chiral two- and three-nucleon interactions used in ab initio calculations of nuclei. We extract equation of state properties, such as the incompressibility and the symmetry energy, and discuss estimates of the theoretical uncertainties due to neglected higher-order contributions in the MBPT expansion as well as the chiral effective field theory expansion. In addition, we discuss the Fermi liquid approach to nuclear matter. We calculate all two- and three-nucleon contributions to the quasiparticle interaction up to second order in MBPT and present results for the Landau parameters, effective mass, and speed of sound for pure neutron matter.

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Phys. Rev. C 112, 055802– Published 19 November, 2025
  • Received 8 May 2025
  • Accepted 16 September 2025
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