TY - JOUR
T1 - Constant-roll brane inflation
AU - Mohammadi, Abolhassan
AU - Golanbari, Tayeb
AU - Nasri, Salah
AU - Saaidi, Khaled
N1 - Funding Information:
We would like to thank H. Azri for careful reading of the paper. The work of A. M. has been supported financially by Vice Chancellorship of Research and Technology, University of Kurdistan under research Project No. 98/10/34704. The work of T. G. has been supported financially by Vice Chancellorship of Research and Technology, University of Kurdistan under research Project No. 98/11/2724.
Publisher Copyright:
© 2020 American Physical Society.
PY - 2020/6/15
Y1 - 2020/6/15
N2 - The scenario of constant-roll inflation in the frame of the Randall-Sundraum II (RS II) brane gravity model is considered. Based on the scenario, the smallness of the second slow-roll parameter is released and it is assumed as a constant which could be of the order of unity. Applying the Hamilton-Jacobi formalism, the constancy of the parameter gives a differential equation for the Hubble parameter which leads to an exact solution for the model. Reconsidering the perturbation equations, we show there are some modified terms appearing in the amplitude of the scalar perturbations and in turn in the scalar spectral index and tensor-to-scalar ratio. Comparing the theoretical results of the model with observational data, the free parameters of the model are determined. Then, the consistency of the model with the swampland criteria is investigated for the obtained values of the free parameters. As the final step, the attractor behavior of the model is considered.
AB - The scenario of constant-roll inflation in the frame of the Randall-Sundraum II (RS II) brane gravity model is considered. Based on the scenario, the smallness of the second slow-roll parameter is released and it is assumed as a constant which could be of the order of unity. Applying the Hamilton-Jacobi formalism, the constancy of the parameter gives a differential equation for the Hubble parameter which leads to an exact solution for the model. Reconsidering the perturbation equations, we show there are some modified terms appearing in the amplitude of the scalar perturbations and in turn in the scalar spectral index and tensor-to-scalar ratio. Comparing the theoretical results of the model with observational data, the free parameters of the model are determined. Then, the consistency of the model with the swampland criteria is investigated for the obtained values of the free parameters. As the final step, the attractor behavior of the model is considered.
UR - http://www.scopus.com/inward/record.url?scp=85087829927&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85087829927&partnerID=8YFLogxK
U2 - 10.1103/PhysRevD.101.123537
DO - 10.1103/PhysRevD.101.123537
M3 - Article
AN - SCOPUS:85087829927
SN - 2470-0010
VL - 101
JO - Physical Review D
JF - Physical Review D
IS - 12
M1 - 123537
ER -