The effective field theory of nonsingular cosmology: II
The effective field theory of nonsingular cosmology: II
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DOI：
10.1140/epjc/s10052-017-4938-y
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发表时间：
2017-01
期刊：
影响因子：
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通讯作者：
Yong Cai;Hai-Guang Li;Taotao Qiu;Yun-song Piao
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文献类型：
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作者：
Yong Cai;Hai-Guang Li;Taotao Qiu;Yun-song Piao
基于宇宙学微扰的有效场论(EFT)，我们明确地阐明了非奇异立方伽利略模型的病理，并展示了如何在EFT中治愈它，并对这个问题有了新的见解。利用能够避免非奇异宇宙中不稳定性的最小EFT算符集，我们构造了一个称为Genesis-Inflation模型的非奇异模型，在该模型中，随着能量密度的增加，一个缓慢扩展的阶段(即，Genesis)之后是慢滚膨胀。原始扰动的频谱可以用数值模拟，这表明它本身是一个大尺度的截止点，因为CMB的大尺度异常可能是一个线索。
Based on the effective field theory (EFT) of cosmological perturbations, we explicitly clarify the pathology in nonsingular cubic Galileon models and show how to cure it in EFT with new insights into this issue. With the least set of EFT operators that are capable to avoid instabilities in nonsingular cosmologies, we construct a nonsingular model dubbed the Genesis-inflation model, in which a slowly expanding phase (namely, Genesis) with increasing energy density is followed by slow-roll inflation. The spectrum of the primordial perturbation may be simulated numerically, which shows itself a large-scale cutoff, as the large-scale anomalies in CMB might be a hint for.