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arXiv 0901.3655astro-ph.CO
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利用红移21厘米观测探测引力波

Gravitational Wave Detection Using Redshifted 21-cm Observations

Somnath Bharadwaj, Tapomoy Guha Sarkar

摘要:

一个引力波穿过视线到达一个遥远的源时会产生一个频率偏移,这个频率偏移会导致红移空间的畸变。因此,引力波在红移空间中被印上了密度涨落的印记。引力波对红移空间功率谱的贡献。与来自特殊速度的主要贡献相比,具有不同的μ依赖性。这使得两个信号可以分离。在观测到的最高红移z处,探测的前景是最有利的。对中性氢(HI)的21厘米红移辐射的观测有可能探测到很高的红移。我们考虑了利用红移空间HI功率谱探测原初引力波的可能性。然而,我们发现,引力波信号,虽然存在,将无法检测到超地平线尺度,因为宇宙的变化和亚地平线尺度的信号是高度抑制。

英文摘要:

A gravitational wave traversing the line of sight to a distant source produces a frequency shift which contributes to redshift space distortion. As a consequence, gravitational waves are imprinted as density fluctuations in redshift space. The gravitational wave contribution to the redshift space power spectrum. has a different μdependence as compared to the dominant contribution from peculiar velocities. This allows the two signals to be separated. The prospect of a detection is most favourable at the highest observable redshift z. Observations of redshifted 21-cm radiation from neutral hydrogen (HI) hold the possibility of probing very high redshifts. We consider the possibility of detecting primordial gravitational waves using the redshift space HI power spectrum. However, we find that the gravitational wave signal, though present, will not be detectable on super-horizon scales because of cosmic variance and on sub-horizon scales where the signal is highly suppressed.

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