NANOGrav hints on planet-mass primordial black holes
NANOGrav hints on planet-mass primordial black holes
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DOI：
10.1007/s11433-021-1839-6
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发表时间：
2020-10
期刊：
影响因子：
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通讯作者：
Guillem Domènech;Shi Pi
中科院分区：
文献类型：
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作者：
Guillem Domènech;Shi Pi
最近，北美纳赫兹引力波天文台(NANOGrav)声称，从其12.5年的数据中探测到了脉冲星定时阵列(PTA)时间残差的随机共谱过程，这可能是首次探测到引力波(GWS)的随机背景。结果表明，这些波的振幅和功率指数表明，它们可能是由−0.091≲w≲0.048的峰值曲率微扰和尘埃状后暴涨时代引起的次生地球引力波。GWS的这种随机背景自然预示着相当于行星质量的原始黑洞(PBHs)的存在，这些原始黑洞可以作为光学引力透镜实验(OGLE)观测到的超短时间尺度微透镜事件的透镜对象。
Recently, the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) claimed the detection of a stochastic common-spectrum process of the pulsar timing array (PTA) time residuals from their 12.5 year data, which might be the first detection of the stochastic background of gravitational waves (GWs). We show that the amplitude and the power index of such waves imply that they could be the secondary GWs induced by the peaked curvature perturbation with a dust-like post inflationary era with −0.091 ≲w≲ 0.048. Such stochastic background of GWs naturally predicts substantial existence of planet-mass primordial black holes (PBHs), which can be the lensing objects for the ultrashort-timescale microlensing events observed by the Optical Gravitational Lensing Experiment (OGLE).