Predictions of quantum gravity in inflationary cosmology: effects of the Weyl-squared term
Predictions of quantum gravity in inflationary cosmology: effects of the Weyl-squared term
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DOI：
10.1007/jhep07(2020)211
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发表时间：
2020-07-29
影响因子：
5.4
通讯作者：
Piva, Marco
中科院分区：
文献类型：
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作者：
Anselmi, Damiano;Bianchi, Eugenio;Piva, Marco
我们导出了具有赝子的量子引力对暴胀宇宙学中标量和张量涨落的振幅和谱指数的预言。作用量是R + R-2加上外尔平方项。鬼被消除，把它变成一个假的，也就是说，一个纯粹的虚拟粒子。我们的工作是围绕德西特背景展开的次领先顺序。这种方法的一致性使虚子的质量m（chi）相对于暴胀子的质量m（phi）有一个下界（m（chi）> m（phi）/4）。张量与标量的比值在小于一个数量级的范围内预测（4/3 < N（2）r < 12到e折叠数N的首阶）。此外，近似或等于-8n（T）的关系r不受Weyl平方项的影响。不存在向量和其他标量/张量自由度。
We derive the predictions of quantum gravity with fakeons on the amplitudes and spectral indices of the scalar and tensor fluctuations in inflationary cosmology. The action is R + R-2 plus the Weyl-squared term. The ghost is eliminated by turning it into a fakeon, that is to say a purely virtual particle. We work to the next-to-leading order of the expansion around the de Sitter background. The consistency of the approach puts a lower bound (m(chi) > m(phi)/4) on the mass m(chi) of the fakeon with respect to the mass m(phi) of the inflaton. The tensor-to-scalar ratioris predicted within less than an order of magnitude (4/3 < N(2)r < 12 to the leading order in the number of e-foldings N). Moreover, the relation r similar or equal to -8n(T) is not affected by the Weyl-squared term. No vector and no other scalar/tensor degree of freedom is present.