arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2110.00550astro-ph.COgr-qc
收藏

最近报道的百万赫兹事件是行星质量的原始黑洞合并吗?

Were recently reported MHz events planet mass primordial black hole mergers?

Guillem Domènech

摘要:

利用体声波谐振腔作为高频引力波天线,最近在$5.5$ MHz频率上探测到了两个罕见事件。假设探测到的事件是由引力波引起的,它们的特征应变振幅约为$h_c\approx 2.5 \times 10^{-16}$。虽然由于高频波携带的巨大能量,宇宙学信号不在图片中,但该信号可能是由于奥尔特云内两个行星质量的原始黑洞($\approx 4\times 10^{-4} M_\odot$)在大约$0.025$ pc($5300$ AU)处合并所致。在这个简短的说明中,我们表明,一个这样的事件发生在这个体积每年的概率是$1:10^{24}$左右,如果这样的土星质量的原始黑洞是$1\%$的暗物质。因此,探测到的信号不太可能是由于行星质量的原始黑洞的合并。然而,下一代引力波探测器,如DECIGO和BBO,可能会发现土星质量的原始黑洞双星的随机背景。

英文摘要:

A bulk acoustic wave cavity as high frequency gravitational wave antenna has recently detected two rare events at $5.5$MHz. Assuming that the detected events are due to gravitational waves, their characteristic strain amplitude lies at about $h_c\approx 2.5 \times 10^{-16}$. While a cosmological signal is out of the picture due to the large energy carried by the high frequency waves, the signal could be due to the merging of two planet mass primordial black holes ($\approx 4\times 10^{-4} M_\odot$) inside the Oort cloud at roughly $0.025$ pc ($5300$ AU) away. In this short note, we show that the probability of one such event to occur within this volume per year is around $1:10^{24}$, if such Saturn-like mass primordial black holes are $1\%$ of the dark matter. Thus, the detected signal is very unlikely to be due the merger of planet mass primordial black holes. Nevertheless, the stochastic background of saturn mass primordial black holes binaries might be seen by next generation gravitational wave detectors, such as DECIGO and BBO.

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。

↑