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Power law inflation with a non-minimally coupled scalar field in light of Planck 2015 data: the exact versus slow roll results
Herrera, Ramón; del Campo, Sergio; Gonzalez, Carlos
We study the power law inflation in the context of non-minimally coupled to the scalar curvature. We analyze the inflationary solutions under an exact analysis and also in the slow roll approximations. In both solutions, we consider the recent data from Planck 2015 data to constraint the parameters in our model. In this framework, we find that in …
Non-local scalar fields inflationary mechanism in light of Planck 2013
Sheikhahmadi, Haidar; Ghorbani, Soheyla; Saaidi, Khaled
A generalization of the canonical and non-canonical theory of inflation is introduced in which the kinetic energy term in action is written as non-local term. The inflationary universe within the framework of considering this non-locality will be studied. To investigate the effects of non-locality on the inflationary parameters we consider two wel…
Constraints on the combined models with R 2 ‑ q f ( R )
Geng, Chao-Qiang; Lee, Chung-Chi; Lin, Shan
We investigate the observational constraints on the modified gravity, which combines the
Consistency relation for natural inflation with Planck 2015 data
Nozari, Kourosh; Kahvaee, H.; Rashidi, N.
We consider the cosine Natural inflation model that is a good candidate to explain the initial accelerating phase of the universe. By computing the inflationary parameters in Einstein frame, we construct a consistency relation between the scalar spectral index, tensor-to-scalar ratio, as well as the running of the scalar spectral index and compare…
Constraining nonminimal DBI inflation with Planck2015 results
Asadi, Kosar; Nozari, Kourosh; Rashidi, Narges
We study cosmological inflation and perturbations in a nonminimally coupled Dirac-Born-Infeld setup in the light of the recent observational data reported by Planck collaboration. By adopting some important inflationary potentials, we analyze the scalar spectral index and the tensor-to-scalar ratio in confrontation with Planck 2015 data. In this m…