Predictions of quantum gravity in inflationary cosmology: effects of the Weyl-squared term
Abstract 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 vir...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2020-07-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | http://link.springer.com/article/10.1007/JHEP07(2020)211 |
| _version_ | 1819046052844535808 |
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| author | Damiano Anselmi Eugenio Bianchi Marco Piva |
| author_facet | Damiano Anselmi Eugenio Bianchi Marco Piva |
| author_sort | Damiano Anselmi |
| collection | DOAJ |
| description | Abstract 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 χ > m ϕ /4) on the mass m χ of the fakeon with respect to the mass m ϕ of the inflaton. The tensor-to-scalar ratio r is predicted within less than an order of magnitude (4/2 < N 2 r <12 to the leading order in the number of e-foldings N). Moreover, the relation r ≃ –8n T is not affected by the Weyl-squared term. No vector and no other scalar/tensor degree of freedom is present. |
| first_indexed | 2024-12-21T10:38:20Z |
| format | Article |
| id | doaj.art-db12b82cdc6647ad9301b704d564524e |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-12-21T10:38:20Z |
| publishDate | 2020-07-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-db12b82cdc6647ad9301b704d564524e2022-12-21T19:07:01ZengSpringerOpenJournal of High Energy Physics1029-84792020-07-012020713310.1007/JHEP07(2020)211Predictions of quantum gravity in inflationary cosmology: effects of the Weyl-squared termDamiano Anselmi0Eugenio Bianchi1Marco Piva2Dipartimento di Fisica “Enrico Fermi”, Università di PisaInstitute for Gravitation and the Cosmos, The Pennsylvania State UniversityNational Institute of Chemical Physics and BiophysicsAbstract 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 χ > m ϕ /4) on the mass m χ of the fakeon with respect to the mass m ϕ of the inflaton. The tensor-to-scalar ratio r is predicted within less than an order of magnitude (4/2 < N 2 r <12 to the leading order in the number of e-foldings N). Moreover, the relation r ≃ –8n T is not affected by the Weyl-squared term. No vector and no other scalar/tensor degree of freedom is present.http://link.springer.com/article/10.1007/JHEP07(2020)211Beyond Standard ModelCosmology of Theories beyond the SMModels of Quant urn Gravity |
| spellingShingle | Damiano Anselmi Eugenio Bianchi Marco Piva Predictions of quantum gravity in inflationary cosmology: effects of the Weyl-squared term Journal of High Energy Physics Beyond Standard Model Cosmology of Theories beyond the SM Models of Quant urn Gravity |
| title | Predictions of quantum gravity in inflationary cosmology: effects of the Weyl-squared term |
| title_full | Predictions of quantum gravity in inflationary cosmology: effects of the Weyl-squared term |
| title_fullStr | Predictions of quantum gravity in inflationary cosmology: effects of the Weyl-squared term |
| title_full_unstemmed | Predictions of quantum gravity in inflationary cosmology: effects of the Weyl-squared term |
| title_short | Predictions of quantum gravity in inflationary cosmology: effects of the Weyl-squared term |
| title_sort | predictions of quantum gravity in inflationary cosmology effects of the weyl squared term |
| topic | Beyond Standard Model Cosmology of Theories beyond the SM Models of Quant urn Gravity |
| url | http://link.springer.com/article/10.1007/JHEP07(2020)211 |
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