Circular Polarization of Primordial Gravitational Waves in String-inspired Inflationary Cosmology
Circular Polarization of Primordial Gravitational Waves in String-inspired Inflationary Cosmology
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DOI：
10.1103/physrevd.77.023526
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发表时间：
2007-06
影响因子：
5
通讯作者：
M. Satoh;S. Kanno;J. Soda
中科院分区：
文献类型：
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作者：
M. Satoh;S. Kanno;J. Soda
我们研究了原始引力波产生圆极化的机制。在弦激发的宇宙学中，圆极化是在由Gauss-Bonnet项驱动的超膨胀过程中产生的。由Gauss-Bonnet项引起的张量模不稳定性和由引力Chern-Simons项引起的宇称破坏是该机制的重要组成部分。我们还讨论了引力波产生的圆偏振的可探测性。事实证明，单场暴涨的简单模型与宇宙微波背景(CMB)观测结果相矛盾。为了绕过这一困难，我们提出了一个两场通货膨胀模型。在这个双场模型中，引力波的圆偏振是在由大爆炸观测者(Bbo)或分赫兹引力波观测站(Decigo)设计的频率范围内产生的。
We study a mechanism to produce the circular polarization of primordial gravitational waves. The circular polarization is generated during the superinflation driven by the Gauss-Bonnet term in the string-inspired cosmology. The instability in the tensor mode caused by the Gauss-Bonnet term and the parity violation due to the gravitational Chern-Simons term are the essential ingredients of the mechanism. We also discuss detectability of the produced circular polarization of gravitational waves. It turns out that the simple model of single-field inflation contradicts cosmic microwave background (CMB) observations. To circumvent this difficulty, we propose a two-field inflation model. In this two-field model, the circular polarization of gravitational waves is created in the frequency range designed by the big-bang observer (BBO) or the deci-hertz gravitational-wave observatory (DECIGO)