Predictions of quantum gravity in inflationary cosmology: effects of the Weyl-squared term

被引：33

作者：

Anselmi, Damiano ^{[1
,2
]}

Bianchi, Eugenio ^{[3
,4
,5
]}

Piva, Marco ^{[6
]}

机构：

[1] Univ Pisa, Dipartimento Fis Enrico Fermi, Largo B Pontecorvo 3, I-56127 Pisa, Italy

[2] Ist Nazl Fis Nucl, Sez Pisa, Largo B Pontecorvo 3, I-56127 Pisa, Italy

[3] Penn State Univ, Inst Gravitat, University Pk, PA 16802 USA

[4] Penn State Univ, Cosmos, University Pk, PA 16802 USA

[5] Penn State Univ, Dept Phys, University Pk, PA 16802 USA

[6] NICPB, Ravala 10, EE-10143 Tallinn, Estonia

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2020年 / 2020卷 / 07期

关键词：

Beyond Standard Model; Cosmology of Theories beyond the SM; Models of Quant urn Gravity; PHASE-TRANSITION; UNIVERSE; FLUCTUATIONS; CREATION; DYNAMICS;

D O I：

10.1007/JHEP07(2020)211

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

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.

引用

页数：33

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