Decomposition of nuclear symmetry energy based on Lorentz-covariant nucleon self-energies in relativistic Hartree-Fock approximation

Tsuyoshi Miyatsu, Myung Ki Cheoun, Chikako Ishizuka, K. S. Kim, Tomoyuki Maruyama, Koichi Saito

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Abstract

Using the Lorentz-covariant decomposition of nucleon self-energies based on the Hugenholtz–Van Hove theorem, we study the effect of Fock terms on the nuclear symmetry energy and its slope parameter within relativistic Hartree-Fock approximation. It is found that the exchange contribution suppresses the nuclear symmetry energy and prevents the slope parameter from increasing monotonically at high densities. Furthermore, not only the isovector-vector (ρ) meson but also the isoscalar mesons (σ,ω) and pion give significant influence on the potential term of nuclear symmetry energy through the exchange diagrams.

Original languageEnglish
Article number135282
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume803
DOIs
Publication statusPublished - 10 Apr 2020

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Keywords

  • Asymmetric nuclear matter
  • Nuclear symmetry energy
  • Relativistic Hartree-Fock approximation

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