We present a k-essence model where a single scalar field is responsible for the early expansion of the Universe through the process of k inflation and at appropriate subsequent stages acts both as dark matter and dark energy.
4/1/2019 · This type of theory is a type of k-essence f (R) gravity, and it belongs to the general class of f (R, ?, X) theories of gravity, where ? is a scalar field and X = 1 2 ? ? ? ? ? ?. We focus on the inflationary phenomenology of the model, in the slow-roll approximation, and we investigate whether viable inflationary evolutions can be realized in the context of this theory.
In many models, this kinetically driven inflation (or “k-inflation” for short) rolls slowly from a high-curvature initial phase, down to a low-curvature phase and can exit inflation to end up …
We then study another k-essence model in which the Lagrangian contains a potential for the scalar field as well as a noncanonical kinetic term. We show that such a model generates the basic features of inflation in the early universe, and also gives rise to dark matter and dark energy at appropriate subsequent stages.
2/10/2019 · k -essence f (R) Gravity Inflation S. Nojiri, S.D. Odintsov, V.K. Oikonomou (Submitted on 10 Feb 2019) In this work we study a modified version of f ( R) gravity in which higher order kinetic terms of a scalar field are added in the action of vacuum f (R) gravity.
In this paper, k- inflation is analyzed in warm braneworld scenario. A general class of k-essence models with power-law kinetic term is investigated and weak and strong dissipation regimes are studied. Scalar perturbations and spectral index are derived. The results are discussed and applied to specific examples.
