Radial oscillations of neutron stars within density-dependent relativistic-mean field models*
Year: 2025
Type: article
Abstract: The radial oscillations of neutron stars are studied using equations of state derived from density-dependent relativistic mean-field (DDRMF) models, which effectively describe the ground-state properties of finite nuclei. A novel numerical approach, the finite volume method (FVM), is employed to solve the eigenvalue problem associated with oscillation frequencies. Compared with conventional methods such as the finite difference method and shooting method, the FVM avoids the numerical instability encountered at high frequencies with an equation of state that includes a discontinuous adiabatic index and offers greater computational efficiency. The oscillation frequencies of high-order modes exhibit a similar trend of change. The radial displacements and pressure perturbations are largely influenced by the equations of state of the crust region. The frequency of the first excited state exhibits a strong linear relationship with both the slope and skewness parameters of the symmetry energy. These findings suggest that the density dependence of the symmetry energy can be constrained through observations of neutron star radial oscillation frequencies.
Source: Chinese Physics C
Authors: Xuesong 雪松 Geng 耿, Kaixuan 开轩 Huang 黄, Hong 虹 Shen 申, Lei 磊 Li 李, Jinniu 金牛 Hu 胡
Institution: Nankai University
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G2079914442, G3555899353
OpenAlex ID: W4413300364