论文标题
径向振荡和重力波回波奇怪的恒星的各种状态方程
Radial oscillations and gravitational wave echoes of strange stars for various equations of state
论文作者
论文摘要
我们研究了三个状态方程（EOSS），即MIT Bag型EOS，线性EOS和多变态EOS的非旋转奇怪恒星及其特征回声频率的径向振荡。这些紧凑型恒星的径向振荡的频率是为这些EOSS计算的。已经计算了这三个EOSS中每一个的22个最低径向频率。首先，对于每个EOS，我们都集成了Tolman-Oppenheimer-Volkoff（TOV）方程，以计算奇怪恒星的径向和压力扰动。接下来，使用这三个EOSS获得这些恒星的质量 - 拉迪乌斯关系。然后计算这些EOSS的振荡的径向频率。此外，针对这些EOSS计算了特征引力回声频率和奇怪恒星回波频率的重复。我们的数值结果表明，径向频率和回声频率在很大程度上取决于模型和模型参数的值。我们的结果还表明，与MIT Bag型EOS和线性EOS相比，奇怪恒星的径向频率对于多变态EOS是最大的。此外，发现带有MIT袋型号EOS和线性EOS的奇怪恒星发出引力波回声。而奇怪的恒星带有多粒子EOS并没有发出引力波回声。
We study the radial oscillations of non-rotating strange stars and their characteristic echo frequencies for three Equations of state (EoSs), viz., MIT Bag model EoS, linear EoS and polytropic EoS. The frequencies of radial oscillations of these compact stars are computed for these EoSs. 22 lowest radial frequencies for each of these three EoSs have been computed. First, for each EoS, we have integrated Tolman-Oppenheimer-Volkoff (TOV) equations numerically to calculate the radial and pressure perturbations of strange stars. Next, the mass-radius relationships for these stars are obtained using these three EoSs. Then the radial frequencies of oscillations for these EoSs are calculated. Further, the characteristic gravitational wave echo frequencies and the repetition of echo frequencies of strange stars are computed for these EoSs. Our numerical results show that the radial frequencies and also echo frequencies vastly depend on the model and on the value of the model parameter. Our results also show that, the radial frequencies of strange stars are maximum for polytropic EoS in comparison to MIT Bag model EoS and linear EoS. Moreover, strange stars with MIT Bag model EoS and linear EoS are found to emit gravitational wave echoes. Whereas, strange stars with polytropic EoS are not emitting gravitational wave echoes.
