Beyond the Starobinsky model for inflation
We single out the Starobinsky model and its extensions among generic f(R) gravity as attractors at large field values for chaotic inflation. Treating a R3 curvature term as a perturbation of the Starobinsky model, we impose the phenomenological bounds on the additional term satisfying the successful...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2020-06-01
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| Series: | Physics Letters B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269320302574 |
| _version_ | 1818995865050677248 |
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| author | Dhong Yeon Cheong Hyun Min Lee Seong Chan Park |
| author_facet | Dhong Yeon Cheong Hyun Min Lee Seong Chan Park |
| author_sort | Dhong Yeon Cheong |
| collection | DOAJ |
| description | We single out the Starobinsky model and its extensions among generic f(R) gravity as attractors at large field values for chaotic inflation. Treating a R3 curvature term as a perturbation of the Starobinsky model, we impose the phenomenological bounds on the additional term satisfying the successful inflationary predictions. We find that the scalar spectral index can vary in both the red or blue tilted direction, depending on the sign of the coefficient of the R3 term, whereas the tensor-to-scalar ratio is less affected in the Planck-compatible region. We also discuss the role of higher order curvature term for stability and the reheating dynamics for the unambiguous prediction for the number of efoldings up to the R3 term. |
| first_indexed | 2024-12-20T21:20:38Z |
| format | Article |
| id | doaj.art-7a36f0ed6e7b4dbe8682458c45d7c230 |
| institution | Directory Open Access Journal |
| issn | 0370-2693 |
| language | English |
| last_indexed | 2024-12-20T21:20:38Z |
| publishDate | 2020-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj.art-7a36f0ed6e7b4dbe8682458c45d7c2302022-12-21T19:26:17ZengElsevierPhysics Letters B0370-26932020-06-01805Beyond the Starobinsky model for inflationDhong Yeon Cheong0Hyun Min Lee1Seong Chan Park2Department of Physics & IPAP & Lab for Dark Universe, Yonsei University, Seoul 03722, Republic of KoreaDepartment of Physics, Chung-Ang University, Seoul 06974, Republic of Korea; CERN, Theory Department, 1211 Geneva 23, Switzerland; Corresponding authors.Department of Physics & IPAP & Lab for Dark Universe, Yonsei University, Seoul 03722, Republic of Korea; Corresponding authors.We single out the Starobinsky model and its extensions among generic f(R) gravity as attractors at large field values for chaotic inflation. Treating a R3 curvature term as a perturbation of the Starobinsky model, we impose the phenomenological bounds on the additional term satisfying the successful inflationary predictions. We find that the scalar spectral index can vary in both the red or blue tilted direction, depending on the sign of the coefficient of the R3 term, whereas the tensor-to-scalar ratio is less affected in the Planck-compatible region. We also discuss the role of higher order curvature term for stability and the reheating dynamics for the unambiguous prediction for the number of efoldings up to the R3 term.http://www.sciencedirect.com/science/article/pii/S0370269320302574 |
| spellingShingle | Dhong Yeon Cheong Hyun Min Lee Seong Chan Park Beyond the Starobinsky model for inflation Physics Letters B |
| title | Beyond the Starobinsky model for inflation |
| title_full | Beyond the Starobinsky model for inflation |
| title_fullStr | Beyond the Starobinsky model for inflation |
| title_full_unstemmed | Beyond the Starobinsky model for inflation |
| title_short | Beyond the Starobinsky model for inflation |
| title_sort | beyond the starobinsky model for inflation |
| url | http://www.sciencedirect.com/science/article/pii/S0370269320302574 |
| work_keys_str_mv | AT dhongyeoncheong beyondthestarobinskymodelforinflation AT hyunminlee beyondthestarobinskymodelforinflation AT seongchanpark beyondthestarobinskymodelforinflation |