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arXiv 1811.03216hep-thastro-ph.COgr-qc
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暴胀理论扩展有效场论中的暴胀扰动谱

Inflationary perturbation spectrum in extended effective field theory of inflation

Jin Qiao, Guang-Hua Ding, Qiang Wu, Tao Zhu, Anzhong Wang

摘要:

暴胀的有效场论为研究原初微扰的新物理效应提供了一个自然的框架。最近,人们提出了一种健康的扩展的EFT与高阶算子的通货膨胀,这避免了鬼,同时导致一个非线性的色散关系的标量扰动。本文利用一致渐近逼近方法研究了这些高阶算子的作用。特别地,我们首先构造标量扰动的模函数的近似解析解。由于高阶算符的存在,微扰模在穿过哈勃半径之前通常会经历一段非绝热演化,这可能导致激发态的产生和原始微扰谱的改变.然而,我们表明,修改后的功率谱仍然是近尺度不变的,高阶算子的存在下,只能影响频谱的整体幅度。特别是,明确显示后,这些新的影响粒子的产生率和扰动谱,我们详细探讨了它们的起源。

英文摘要:

The effective field theory (EFT) of inflation provides a natural framework to study the new physical effects on primordial perturbations. Recently a healthy extension of the EFT of inflation with high-order operators has been proposed, which avoids ghosts and meanwhile leads to a nonlinear dispersion relation of the scalar perturbations. This paper is devoted to studying the effects of these high-order operators by using the uniform asymptotic approximation method. In particular, we first construct the approximate analytical solution to the mode function of the scalar perturbations. Because of the presence of the high-order operators, the perturbation modes usually experience a period of non-adiabatic evolution before they cross the Hubble radius, which could lead to the production of excited states and modifications of the primordial perturbation spectrum. However, we show that the modified power spectrum is still nearly scale-invariant and the presence of the high-order operators can only affect the overall amplitude of the spectrum. In particular, after showing explicitly the impact of these new effects on particle production rate and perturbation spectrum, we explore their origin in detail.

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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