Gravitational waves from an early matter era

Gravitational waves from an early matter era
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来自早期物质时代的引力波

DOI:
10.1103/physrevd.79.083511
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发表时间:
2009
期刊:
影响因子:
5
通讯作者:
Assadullahi H
Assadullahi H
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Assadullahi H

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我们研究了在早期物质主导时代由于原始密度扰动的引力不稳定性而产生的引力波,这些引力波可以通过激光干涉仪引力波天文台(LIGO)和激光干涉仪空间天线(丽莎)等实验来检测。我们使用相对论微扰理论给出线性密度微扰产生的二阶张量微扰的解析估计。我们发现,大的增强因子相对于天真的二阶估计是可能的,由于子哈勃尺度上的密度扰动的增长。然而,非常大的增强因子与小尺度密度扰动线性理论的崩溃相吻合。为了产生一个原始的引力波背景,这将是可检测的LIGO或丽莎的密度扰动在线性制度需要原始的共动曲率扰动的小尺度上的0.02为先进的LIGO或0.005为丽莎;否则的非线性演化的数值计算子哈勃尺度上是必需的。
We investigate the generation of gravitational waves due to the gravitational instability of primordial density perturbations in an early matter-dominated era which could be detectable by experiments such as laser interferometer gravitational wave observatory (LIGO) and laser interferometer space antenna (LISA). We use relativistic perturbation theory to give analytic estimates of the tensor perturbations generated at second order by linear density perturbations. We find that large enhancement factors with respect to the naive second-order estimate are possible due to the growth of density perturbations on sub-Hubble scales. However very large enhancement factors coincide with a breakdown of linear theory for density perturbations on small scales. To produce a primordial gravitational-wave background that would be detectable with LIGO or LISA from density perturbations in the linear regime requires primordial comoving curvature perturbations on small scales of order 0.02 for advanced LIGO or 0.005 for LISA; otherwise numerical calculations of the nonlinear evolution on sub-Hubble scales are required.
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