Gravitational wave background from neutrino-driven gamma-ray bursts
Gravitational wave background from neutrino-driven gamma-ray bursts
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DOI：
10.1111/j.1365-2966.2005.09643.x
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发表时间：
2005-09
影响因子：
4.8
通讯作者：
T. Hiramatsu;K. Kotake;H. Kudoh;A. Taruya
中科院分区：
文献类型：
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作者：
T. Hiramatsu;K. Kotake;H. Kudoh;A. Taruya
本文讨论了宇宙学总体伽玛暴的引力波背景。在引力波的各种发射机制中，我们特别关注所谓失败的超新星爆炸后形成的黑洞周围吸积盘的巨大各向异性中微子发射。由这种机制产生的GWs被称为“记忆突发”，并且可以在低于10 Hz的低频区域占主导地位。为了估计它们的振幅，我们推导了轴对称喷流引力波形的一般解析公式。基于这些公式，我们首先对单个伽玛暴产生的GWs谱进行了量化。然后，对宇宙学布居求和，我们发现在低频区的宽频带f = 10 - 4 - 10 1Hz上，密度参数的合成值约为Ω GW 10 - 20。GWB的振幅明显小于起源于暴胀时期的原始GWB的振幅，并且远低于检测限。
We discuss the gravitational wave background (GWB) from a cosmological population of gamma-ray bursts (GRBs). Among the various emission mechanisms for the gravitational waves (GWs), we pay particular attention to the vast anisotropic neutrino emissions from the accretion discs around black holes formed after so-called failed supernova explosions. The GWs produced by such mechanisms are known as 'burst with memory', and could dominate in the low-frequency regime below ∼10 Hz. To estimate their amplitudes, we derive general analytic formulae for gravitational waveforms from the axisymmetric jets. Based on the formulae, we first quantify the spectrum of GWs from a single GRB. Then, summing the cosmological population, we find that the resultant value of the density parameter becomes roughly Ω GW 10 -20 over the wide-band of the low-frequency region, f ∼ 10 -4 - 10 1 Hz. The amplitude of the GWB is significantly smaller than that of the primordial GWB originating from the inflationary epoch, and is far below the detection limit.