| dc.creator | Medeiros, Léo Gouvêa | |
| dc.creator | Cuzinatto, R. R. | |
| dc.creator | Pompeiae, P. J. | |
| dc.date | 2020-08-26T14:55:08Z | |
| dc.date | 2020-08-26T14:55:08Z | |
| dc.date | 2019-02-27 | |
| dc.identifier | CUZINATTO, R.R.; MEDEIROS, L.G.; POMPEIA, P.J.. Higher-order modified Starobinsky inflation. Journal of Cosmology and Astroparticle Physics, [s.l.], v. 2019, n. 02, p. 055-055, 27 fev. 2019. Disponível em: https://iopscience.iop.org/article/10.1088/1475-7516/2019/02/055. Acesso em: 12 ago. 2020. http://dx.doi.org/10.1088/1475-7516/2019/02/055. | |
| dc.identifier | 1475-7516 | |
| dc.identifier | https://repositorio.ufrn.br/jspui/handle/123456789/29894 | |
| dc.identifier | 10.1088/1475-7516/2019/02/055 | |
| dc.description | An extension of the Starobinsky model is proposed. Besides the usual Starobinsky Lagrangian, a term proportional to the derivative of the scalar curvature, ∇μR∇μR, is considered. The analyzis is done in the Einstein frame with the introduction of a scalar field and a vector field. We show that inflation is attainable in our model, allowing for a graceful exit. We also build the cosmological perturbations and obtain the leading-order curvature power spectrum, scalar and tensor tilts and tensor-to-scalar ratio. The tensor and curvature power spectrums are compared to the most recent observations from BICEP2/Keck collaboration. We verify that the scalar-to-tensor rate r can be expected to be up to three times the values predicted by Starobinsky model | |
| dc.language | en | |
| dc.publisher | IOP Publishing | |
| dc.subject | Cosmological perturbation theory | |
| dc.subject | Inflation | |
| dc.subject | Modified gravity | |
| dc.title | Higher-order modified Starobinsky inflation | |
| dc.type | article | |
