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arXiv 1707.08282hep-thastro-ph.COgr-qchep-ph
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多场暴胀中的一致性关系

Consistency relations in multi-field inflation

Jinn-Ouk Gong, Min-Seok Seo

摘要:

我们研究了多场暴胀中空间坐标变换的结果。在自发破缺的德西特等距中,只有共动规范中的伸缩保持了度规的形式,从而得到量子保护的斯拉夫诺夫-泰勒恒等式。利用连通格林函数和单粒子不可约格林函数,从两种不同的角度导出了宇宙学扰动的关联函数之间的对应相容关系。给出了最低阶的一致性关系,并发现即使在多场暴胀中,软极限的一致性关系也与物质扇区的细节无关。

英文摘要:

We study the consequences of spatial coordinate transformation in multi-field inflation. Among the spontaneously broken de Sitter isometries, only dilatation in the comoving gauge preserves the form of the metric and thus results in quantum-protected Slavnov-Taylor identities. We derive the corresponding consistency relations between correlation functions of cosmological perturbations in two different ways, by the connected and one-particle-irreducible Green's functions. The lowest-order consistency relations are explicitly given, and we find that even in multi-field inflation the consistency relations in the soft limit are independent of the detail of the matter sector.

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