Cosmological gravitational wave background from primordial density perturbations
Cosmological gravitational wave background from primordial density perturbations
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DOI：
10.1103/physrevd.75.123518
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发表时间：
2007-06-01
影响因子：
5
通讯作者：
Wands, David
中科院分区：
文献类型：
--
作者：
Ananda, Kishore N.;Clarkson, Chris;Wands, David
我们讨论了在辐射时代由原始密度微扰产生的引力波背景。在微扰膨胀中的二阶，密度涨落产生引力波。我们从这个机制计算了引力波的功率谱，并表明，原则上，未来的引力波探测器可以用来限制原始功率谱在与目前由大尺度结构探测的尺度截然不同的尺度上。作为例子，我们计算了由所有尺度上的幂函数谱和单尺度上的增量函数功率谱产生的引力波背景。
We discuss the gravitational wave background generated by primordial density perturbations evolving during the radiation era. At second order in a perturbative expansion, density fluctuations produce gravitational waves. We calculate the power spectra of gravitational waves from this mechanism, and show that, in principle, future gravitational wave detectors could be used to constrain the primordial power spectrum on scales vastly different from those currently being probed by a large-scale structure. As examples we compute the gravitational wave background generated by both a power-law spectrum on all scales, and a delta-function power spectrum on a single scale.