Open AccessEffect of Fock terms on nuclear symmetry energy based on Lorentz-covariant decomposition of nucleon self-energies
Author(s) -
Tsuyoshi Miyatsu,
Myung Ki Cheoun,
Chikako Ishizuka,
K. S. Kim,
Tomoyuki Maruyama,
Koichi Saito
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1643/1/012015
Subject(s) - isovector , physics , fock space , nucleon , isoscalar , covariant transformation , meson , lorentz transformation , quantum electrodynamics , symmetry (geometry) , mathematical physics , nuclear physics , quantum mechanics , geometry , mathematics
Using the Lorentz-covariant decomposition of nucleon self-energies with relativistic mean-field approximation, we study the effect of Fock terms on the density dependence of nuclear symmetry energy, E sym . It is found that the Fock contribution suppresses the potential part of E sym at higher densities, and the constraint from the heavy-ion collision data is in favor of the present result including exchange terms with the cutoff parameters given by the CD-Bonn potential. In addition, not only the isovector-vector ( ρ ) meson but also the isoscalar ( σ, ω ) and π mesons give influence on the potential part of E sym through the exchange diagram.