Constraints on the nuclear symmetry energy via asteroseismology

NEB 15 – Recent Developments in Gravity

Sotani, Hajime^1 ; Nakazato, Ken'Ichiro^2 ; Iida, Kei^3 ; Oyamatsu, Kazuhiro^4

Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan^1

Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan^2

Department of Natural Science, Kochi University, 2-5-1 Akebono-cho, Chiba 780-8520, Japan^3

Department of Human Informatics, Aichi Shukutoku University, 9 Katahira, Nagakute, Aichi 480-1197, Japan^4

关键词: Asteroseismology;    Crystalline properties;    Density dependence;    Density derivatives;    Nuclear symmetry energy;    Quasiperiodic oscillations;    Symmetry energies;    Torsional oscillation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/453/1/012016/pdf
DOI  :  10.1088/1742-6596/453/1/012016

来源: IOP

【 摘 要 】

We examine the fundamental torsional oscillations of the crust in the neutron star. Especially, we focus on the crystalline properties obtained from macroscopic nuclear models. As a result, we find that the frequencies of fundamental torsional oscillations are sensitive to the density dependence of the symmetry energy, but almost independent of the incompressibility of symmetric nuclear matter. Identifying the lowest frequency among the quasi-periodic oscillations observed in the giant flares as the fundamental= 2 torsional oscillations, we put constraints on the density derivative of the symmetry energy as L50 MeV.