Probing primordial–black-hole dark matter with scalar induced gravitational waves

Probing primordial–black-hole dark matter with scalar induced gravitational waves
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用标量诱发引力波探测原始黑洞暗物质

DOI:
10.1103/physrevd.100.081301
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发表时间:
2019-06
期刊:
Phys.Rev. D
影响因子:
--
通讯作者:
Qing-Guo Huang
Qing-Guo Huang
中科院分区:
其他
文献类型:
--
作者:
Chen Yuan;Zu-Cheng Chen;Qing-Guo Huang

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原始黑洞(PBH)代表宇宙中所有暗物质(DM)并解释LIGO/Virgo探测到的二元黑洞合并的可能性吸引了很多关注。PBH是由标量扰动的增强产生的,而标量扰动的增强不可避免地产生了感生引力波。我们计算了三阶修正后的感生GWs,这不仅提高了感生GWs的幅度,而且将截止频率从2k *$扩展到3 k *$。三阶修正的这种效应使得丽莎和脉冲星定时阵列(PTA)观测的信噪比(SNR)都增加了约10%,并显著扩大了IPTA、FAST和SKA等PTA观测中伴随可探测到的感生GWs的恒星质量窗口中PBH的质量范围。另一方面,丽莎和PTA实验对诱导GW的零检测将排除所有DM由PBH组成以及LIGO/Virgo检测到的GW事件由PBH产生的可能性。
The possibility that primordial black holes (PBHs) represent all of the dark matter (DM) in the Universe and explain the coalescences of binary black holes detected by LIGO/Virgo has attracted a lot of attention. PBHs are generated by the enhancement of scalar perturbations which inevitably produce the induced gravitational waves (GWs). We calculate the induced GWs up to the third-order correction which not only enhances the amplitude of induced GWs, but also extends the cutoff frequency from $2k_*$ to $3k_*$. Such effects of the third-order correction lead to an around $10\%$ increase of the signal-to-noise ratio (SNR) for both LISA and pulsar timing array (PTA) observations, and significantly widen the mass range of PBHs in the stellar mass window accompanying detectable induced GWs for PTA observations including IPTA, FAST and SKA. On the other hand, the null detections of the induced GWs by LISA and PTA experiments will exclude the possibility that all of the DM is comprised of PBHs and the GW events detected by LIGO/Virgo are generated by PBHs.
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