Exploring the Link between Fast Radio Burst and Binary Neutron Star Origins with Spaceborne Gravitational Wave Observations

Yu-xuan Yin, 宇轩 尹, En-kun Li, 恩坤 李, Bing Zhang, 冰 张, Yi-Ming Hu and 一鸣 胡
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Abstract

The origin of repeating fast radio bursts (rFRBs) is an open question, with observations suggesting that at least some are associated with old stellar populations. It has been proposed that some rFRBs may be produced by interactions of the binary neutron star (BNS) magnetospheres decades to centuries before the coalescence. These systems would also emit centi-Hertz gravitational waves during this period, which can be detectable by spaceborne gravitational wave detectors. We explore the prospects of using current and future spaceborne gravitational wave detectors, such as TianQin, LISA, and DECIGO, to test this fast radio burst (FRB) formation hypothesis. Focusing on nearby galaxies like M81, which hosts an rFRB source in a globular cluster, we calculate the detection capabilities for BNS systems. Our analysis reveals that while missions like TianQin and LISA face limitations in horizon distance, changing the detector pointing direction could significantly enhance detection probabilities. Considering that the chance of a Milky Way–like galaxy coincidentally containing a BNS within 100 yr before merger is only 3 × 10−5–5 × 10−3, if a signal is detected originating from M81, we can establish the link between FRBs and BNSs with a significance level of at least 2.81σ. For TianQin and LISA, Bayes factors for rFRB–BNS associations range from 4 × 106 to 7 × 108 under ideal assumptions of uniform event distribution, dropping to 5 × 102–105 when accounting for the fact that the events are confined in galaxies. Next-generation detectors such as DECIGO offer enhanced capabilities compared to TianQin and LISA and should easily detect these systems in M81 and beyond. DECIGO can boost the Bayes factor by up to 4 orders of magnitude (1010–1012 ideally and 104–106 realistically). Our work highlights the critical role of spaceborne gravitational wave missions in unraveling FRB origins.
利用星载引力波观测探索快速射电暴与双中子星起源之间的联系
重复快速射电暴(rfrb)的起源是一个悬而未决的问题,观察表明至少有一些与古老的恒星群有关。有人提出,一些rfrb可能是由双中子星(BNS)磁球在合并前几十年到几百年的相互作用产生的。在此期间,这些系统还会发出厘赫兹引力波,可以被太空引力波探测器探测到。我们探索了使用当前和未来的星载引力波探测器(如天琴、LISA和DECIGO)来测试快速射电暴(FRB)形成假说的前景。以M81等邻近星系为例,我们计算了BNS系统的探测能力。M81在球状星团中拥有一个rFRB源。我们的分析表明,虽然像天琴和LISA这样的任务在视界距离上受到限制,但改变探测器指向的方向可以显著提高探测概率。考虑到在合并前100年内碰巧包含BNS的类银河系星系的机会只有3 × 10−5-5 × 10−3,如果探测到来自M81的信号,我们可以建立快速射电暴和BNS之间的联系,其显著性水平至少为2.81σ。对于TianQin和LISA来说,在均匀事件分布的理想假设下,rFRB-BNS关联的贝叶斯因子范围为4 × 106 ~ 7 × 108,当考虑到事件被限制在星系中时,贝叶斯因子降至5 × 102-105。与天琴和LISA相比,DECIGO等下一代探测器提供了增强的功能,可以轻松地在M81及以后检测到这些系统。DECIGO可以将贝叶斯因子提高4个数量级(理想值为1010-1012,实际值为104-106)。我们的工作强调了星载引力波任务在解开快速射电暴起源中的关键作用。
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