arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.06553gr-qcastro-ph.HEastro-ph.SR
收藏

各种状态方程下奇异星的径向振荡和引力波回波

Radial oscillations and gravitational wave echoes of strange stars for various equations of state

Jyatsnasree Bora, Umananda Dev Goswami

摘要:

我们研究了非旋转奇异星的径向振荡及其三种状态方程的特征回波频率,MIT Bag模型EoS、线性EoS和多变EoS。这些紧凑型恒星的径向振荡的频率计算这些EOS。计算了这三个EOS中每个EOS的22个最低径向频率。首先,对于每一个EoS,我们已经集成的TOV方程数值计算奇异星的径向和压力扰动。接下来,这些恒星的质量-半径关系是使用这三个EOS获得的。然后计算了这些EOS的径向振荡频率。进一步计算了这些恒星的特征引力波回波频率和奇异星回波频率的重复性。我们的数值结果表明,径向频率和回波频率极大地依赖于模型和模型参数的值。我们的结果还表明,奇异星的径向频率是最大的多变EoS相比,MIT袋模型EoS和线性EoS。此外,还发现了MIT Bag模型的EoS和线性EoS奇异星发射的引力波回波。而具有多变EoS的奇异星则不发射引力波回波。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑