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arXiv 0706.3495astro-ph
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星族III星的引力波背景

Gravitational Wave Background from Population III Stars

Yudai Suwa, Tomoya Takiwaki, Kei Kotake, Katsuhiko Sato

摘要:

我们使用流体动力学模拟的结果估计了来自第三星族(Pop III)恒星的引力波(GW)背景(Suwa et al. 2007)。我们计算重力波形的物质运动和各向异性中微子排放的单一流行III星。我们发现,GW振幅从物质运动是占主导地位的,直到刚刚反弹后,但那些从中微子占主导地位的频率低于$\sim 10$ Hz的GW频谱。计算由这样的Pop III星的合奏产生的整体信号,我们发现,由此产生的GW背景的密度参数峰值在$Ω_\mathrm{GW}\sim 10^{-10}$的振幅在频率间隔$\sim 1-10$ Hz。我们表明,这样的信号,取决于流行III星的形成率,可以在未来计划的干涉仪,如DECIGO和BBO的检测范围内的频率间隔为$\sim 0.1-1$ Hz。我们的研究结果表明,从Pop III星的GW背景的检测可以是一个重要的工具,提供有关的恒星形成历史的早期宇宙的信息。

英文摘要:

We estimate the gravitational wave (GW) background from Population III (Pop III) stars using the results from our hydrodynamic simulations (Suwa et al. 2007). We calculate gravitational waveforms from matter motions and anisotropic neutrino emissions for single Pop III stars. We find that the GW amplitudes from matter motions are dominant until just after bounce, but those from neutrinos dominate later on at frequencies below $\sim 10$ Hz in the GW spectrum. Computing the overall signal produced by the ensemble of such Pop III stars, we find that the resultant density parameter of the GW background peaks at the amplitude of $Ω_\mathrm{GW}\sim 10^{-10}$ in the frequency interval $\sim 1-10$ Hz. We show that such signals, depending on the formation rate of Pop III stars, can be within the detection limits of future planned interferometers such as DECIGO and BBO in the frequency interval of $\sim 0.1-1$ Hz. Our results suggest that the detection of the GW background from Pop III stars can be an important tool to supply the information about the star formation history in the early universe.

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