论文标题
来自Strangeon星星的振荡模式和重力波
Oscillation Modes and Gravitational Waves from Strangeon Stars
论文作者
论文摘要
低能尺度上的强相互作用决定了中子星（NSS）中近核问题的状态方程（EOS）。据推测，散装密集物可能是由奇异子组成的，这些物质是夸克簇，数量几乎相等，$ u $，$ d $和$ s $ quarks。为了表征短距离的强脉冲相互作用和奇异子的非依赖性性质，使用两个参数的现象学Lennard-Jones模型来描述Strangeon Stars（SSS）的EOS。我们首次研究了非旋转SSS的振荡模式，并获得了EOS各种参数化的频率。我们发现，SSS的径向振荡的性质与NSS的性质不同，特别是对于中央能密度相对较低的恒星。此外，我们计算了相对论的套管近似中SSS的$ f $ mmode频率。发现SSS的$ F $模板的频率在$ 6.7 \，$ kHz到$ 8.7 \，\ rm {kHz} $范围内。最后，我们研究了SSS的$ f $ mode频率与全局性能之间的普遍关系，例如紧凑性和潮汐变形性。我们获得的结果与脉冲星的时机和重力波有关，并将有助于探测NSS的EOSS和推断量子染色体动力学中的非扰动行为。
The strong interaction at low energy scales determines the equation of state (EOS) of supranuclear matters in neutron stars (NSs). It is conjectured that the bulk dense matter may be composed of strangeons, which are quark clusters with nearly equal numbers of $u$, $d$, and $s$ quarks. To characterize the strong-repulsive interaction at short distance and the nonrelativistic nature of strangeons, a phenomenological Lennard-Jones model with two parameters is used to describe the EOS of strangeon stars (SSs). For the first time, we investigate the oscillation modes of non-rotating SSs and obtain their frequencies for various parameterizations of the EOS. We find that the properties of radial oscillations of SSs are different from those of NSs, especially for stars with relatively low central energy densities. Moreover, we calculate the $f$-mode frequency of nonradial oscillations of SSs within the relativistic Cowling approximation. The frequencies of the $f$-mode of SSs are found to be in the range from $6.7\,$kHz to $ 8.7\,\rm{kHz}$. Finally, we study the universal relations between the $f$-mode frequency and global properties of SSs, such as the compactness and the tidal deformability. The results we obtained are relevant to pulsar timing and gravitational waves, and will help to probe NSs' EOSs and infer nonperturbative behaviours in quantum chromodynamics.
