Gravitational waves from a curvaton model with blue spectrum
Gravitational waves from a curvaton model with blue spectrum
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DOI：
10.1088/1475-7516/2013/08/042
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发表时间：
2013-05
期刊：
影响因子：
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通讯作者：
M. Kawasaki;N. Kitajima;Shuichiro Yokoyama
中科院分区：
文献类型：
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作者：
M. Kawasaki;N. Kitajima;Shuichiro Yokoyama
本文研究了曲率模型中一阶标量扰动引起的引力波背景。我们考虑了二次类轴子曲率势，它可以在小尺度上产生曲率扰动的蓝倾功率谱，并导出了目前最大量的引力波背景。我们发现，在曲率不支配宇宙能量密度的情况下，在曲率衰变时，引力波背景的功率谱在与重返视界尺度对应的频率处有一个特征峰。我们还发现，在曲率支配宇宙能量密度的情况下，引力波的数量增加。未来的空间引力波探测器或脉冲星定时观测将可以探测到这种感应引力波。
We investigate the gravitational wave background induced by the first order scalar perturbations in the curvaton models. We consider the quadratic and axion-like curvaton potential which can generate the blue-tilted power spectrum of curvature perturbations on small scales and derive the maximal amount of gravitational wave background today. We find the power spectrum of the induced gravitational wave background has a characteristic peak at the frequency corresponding to the scale reentering the horizon at the curvaton decay, in the case where the curvaton does not dominate the energy density of the Universe. We also find the enhancement of the amount of the gravitational waves in the case where the curvaton dominates the energy density of the Universe. Such induced gravitational waves would be detectable by the future space-based gravitational wave detectors or pulsar timing observations.