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arXiv 2002.08157gr-qc
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一维纯二次引力中的原初引力波

One-Dimensional Primordial Gravitational Waves In Pure Quadratic Gravity

Taimur Mohammadi, Behrooz Malekolkalami

AI总结:

本文在纯二次引力的一维玩具模型中研究原初引力波,发现阻尼指数解能产生尺度不变谱,而振荡解被排除,该谱与CMB数据一致。

摘要:

在早期宇宙中,随机背景波的几乎尺度不变谱是暴胀场景的一个坚定预测。在本工作中,为了研究原初引力波,我们考虑了一个在爱因斯坦-希尔伯特框架推广下的一维玩具模型,该模型由二阶曲率不变量(称为纯二次引力)描述。原初扰动的解比爱因斯坦-希尔伯特框架中的解更加多样化,包括简单的入射波和出射波。通过检查扰动解的谱图,可以看出振荡解因不具备必要的谱功率而被排除,而阻尼指数解则能够产生尺度不变谱(已由CMB数据确认)。

英文摘要:

The almost scale-invariant spectrum for the stochastic background wave (in primordial Universe) is a firm prediction of inflationary scenarios. In the present work, to study of primordial Gravitational Waves, one dimensional toy model in generalizations of the Einstein-Hilbert frame, described by second order curvature invariant (called pure Quadratic Gravity) is considered. Solutions to the primordial perturbations are more varied than Einstein-Hilbert frame and include simple incoming and outcoming waves. By examining the spectrum diagram of the perturbation solutions, it can be seen that the oscillating solutions are ruled out due to not having the necessary spectral power, but the solutions as damping exponential have the ability to produce a scale-invariant spectrum (confirmed by CMB data).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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