We are taking action of f(R) gravity with a nonminimal coupling to a massive inflaton field. A f(R,ϕ) model is chosen which leads to the scalar-tensor theory which can be transformed to Einstein frame by conformal transformation. To avoid the vagueness of the frame dependence, we evaluate the exact analytical solutions for inflationary era in Jordan frame and find a condition for graceful exit from inflation. Furthermore, we calculate the perturbed parameters (i.e., number of e-folds, slow-roll parameters, scalar and tensor power spectra, corresponding spectral indices, and tensor to scalar ratio). It is showed that the tensor power spectra lead to blue tilt for this model. The trajectories of the perturbed parameters are plotted to compare...
© 2020 by the authors. Licensee MDPI, Basel, Switzerland. We investigate the ability of the exponent...
© 2017 World Scientific Publishing Company. We investigate the inflationary realization in the conte...
© 2017 World Scientific Publishing Company. We investigate the inflationary realization in the conte...
We consider an f (R) action that is non-minimally coupled to a massive scalar field. The model close...
We consider a modified gravity model of the form f(R,phi)=Reh(phi)R, where the strong gravity correc...
In this work, we study on the inflationary era of the Universe in the context of f(R) gravity. For t...
Abstract The previously introduced class of two-parametric phenomenological inflationary models in g...
AbstractIn this paper, we study the case of single field inflation within the framework of modified ...
We study f(R) gravity models in the language of scalar–tensor (ST) theories. The correspondence betw...
In this paper, we study the case of single field inflation within the framework of modified gravity ...
In this work we study a modified version of f(R) gravity in which higher order kinetic terms of a sc...
© 2014 American Physical Society. We investigate the descriptions for the observables of inflationar...
© 2014 American Physical Society. We investigate the descriptions for the observables of inflationar...
© 2014 American Physical Society. We investigate the descriptions for the observables of inflationar...
Abstract We have considered the perturbation equations governing the growth of fluctuations during i...
© 2020 by the authors. Licensee MDPI, Basel, Switzerland. We investigate the ability of the exponent...
© 2017 World Scientific Publishing Company. We investigate the inflationary realization in the conte...
© 2017 World Scientific Publishing Company. We investigate the inflationary realization in the conte...
We consider an f (R) action that is non-minimally coupled to a massive scalar field. The model close...
We consider a modified gravity model of the form f(R,phi)=Reh(phi)R, where the strong gravity correc...
In this work, we study on the inflationary era of the Universe in the context of f(R) gravity. For t...
Abstract The previously introduced class of two-parametric phenomenological inflationary models in g...
AbstractIn this paper, we study the case of single field inflation within the framework of modified ...
We study f(R) gravity models in the language of scalar–tensor (ST) theories. The correspondence betw...
In this paper, we study the case of single field inflation within the framework of modified gravity ...
In this work we study a modified version of f(R) gravity in which higher order kinetic terms of a sc...
© 2014 American Physical Society. We investigate the descriptions for the observables of inflationar...
© 2014 American Physical Society. We investigate the descriptions for the observables of inflationar...
© 2014 American Physical Society. We investigate the descriptions for the observables of inflationar...
Abstract We have considered the perturbation equations governing the growth of fluctuations during i...
© 2020 by the authors. Licensee MDPI, Basel, Switzerland. We investigate the ability of the exponent...
© 2017 World Scientific Publishing Company. We investigate the inflationary realization in the conte...
© 2017 World Scientific Publishing Company. We investigate the inflationary realization in the conte...