arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2102.12455astro-ph.HEgr-qc
收藏

孤立中子星和合并后残余物普适关系中的频率偏差

Frequency deviations in universal relations of isolated neutron stars and postmerger remnants

Georgios Lioutas, Andreas Bauswein, Nikolaos Stergioulas

摘要:

我们将孤立非旋转中子星的基本四极流体模与中子星合并残余物的主振荡频率联系起来。这两个频率分别与某些恒星的参数,如半径或潮汐变形,我们进一步调查,通过构建拟合公式和量化的数据点的分散从这些关系。此外,我们还比较了单个数据点如何偏离所有数据点的相应拟合。考虑到这种点到点的分散,我们发现孤立的NS和振荡频率的快速旋转,热,大规模的合并残留物的扰动数据的频率偏差之间的惊人的相似性。这些非常不同的恒星系统中频率偏差的对应关系指向一个潜在的机制和编码在频率偏差中的EoS信息。我们跟踪的频率散射回的潮汐勒夫数的偏差,从一个平均潮汐勒夫数为一个给定的恒星的紧凑性。因此,我们的结果表明,有可能打破NS半径,潮汐变形和潮汐勒夫数之间的简并。我们还涉及到频率偏差的潮汐变形的导数相对于质量。我们的研究结果一般突出了一种可能性,以改善GW asteroseismology的关系,系统的频率偏差的行为,以减少这种关系的分散,从而提高测量精度。此外,我们还将静态恒星的f模频率与合并残余物的主导GW频率联系起来。我们发现一个解析映射连接的质量恒星系统,这产生特别准确的质量独立的关系,两个频率之间的合并后的频率和潮汐变形。

英文摘要:

We relate the fundamental quadrupolar fluid mode of isolated non-rotating NSs and the dominant oscillation frequency of neutron star merger remnants. Both frequencies individually are known to correlate with certain stellar parameters like radii or the tidal deformability, which we further investigate by constructing fit formulae and quantifying the scatter of the data points from those relations. Furthermore, we compare how individual data points deviate from the corresponding fit to all data points. Considering this point-to-point scatter we uncover a striking similarity between the frequency deviations of perturbative data for isolated NSs and of oscillation frequencies of rapidly rotating, hot, massive merger remnants. The correspondence of frequency deviations in these very different stellar systems points to an underlying mechanism and EoS information being encoded in the frequency deviation. We trace the frequency scatter back to deviations of the tidal Love number from an average tidal Love number for a given stellar compactness. Our results thus indicate a possibility to break the degeneracy between NS radii, tidal deformability and tidal Love number. We also relate frequency deviations to the derivative of the tidal deformability with respect to mass. Our findings generally highlight a possibility to improve GW asteroseismology relations where the systematic behavior of frequency deviations is employed to reduce the scatter in such relationships and consequently increase the measurement accuracy. In addition, we relate the f-mode frequency of static stars and the dominant GW frequency of merger remnants. We find an analytic mapping to connect the masses of both stellar systems, which yields particularly accurate mass-independent relations between both frequencies and between the postmerger frequency and the tidal deformability.

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。

↑