2024/03/18 by Taiichi Yamada, Yamada, Taiichi
Physics and Astronomy · #FOS: Physical sciences #Nuclear Theory (nucl-th) #Nuclear physics research studies #Pulsars and Gravitational Waves Research #Quantum, superfluid, helium dynamics
paper · pdf · doi:10.48550/arxiv.2403.11717
openalex publication_date 2024/03/18 · openalex created_date 2024/03/20 · openalex updated_date 2026/07/28
The equations of state for symmetric nuclear matter and pure neutron matter are investigated with the tensor-optimized Fermi Sphere method (TOFS) up to the density ρ=0.5~fm-3. This method is based on a linked-cluster expansion theorem, and the energy per particle of nuclear matter (E/A) is calculated variationally with respect to the correlated nuclear matter wave function. We can study the density dependence of the many-body terms arising from the operator products, which contribute to E/A. In order to clarify the relation between the many-body effects and short-range correlation, we take the spin-isospin dependent central \it NN interaction with a few GeV repulsion in the inner region. The EOS obtained by the TOFS method is reasonably reproduced, compared with other ab initio many-body methods. We found that the many-body terms from the 2-body to 6-body ones) give sizable effects on E/A at higher density, and they play an important role in nuclear matter.