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Thermodynamical correspondence of gravity in Jordan and Einstein frames
G. G. L. Nashed, W. El Hanafy, S. D. Odintsov +1
We study the thermodynamical aspects of gravity in the Jordan and the Einstein frame, and we investigate the corresponding equivalence of the thermodynamical quantities in t…
Unifying Inflation with Early and Late-time Dark Energy in Gravity
Shin'ichi Nojiri, Sergei D. Odintsov, V. K. Oikonomou
In this work we shall present models of gravity which realize in a unified way the inflationary era along with a post-inflationary early dark energy era, with the late-time…
Constant-roll -Inflation Dynamics
S. D. Odintsov, V. K. Oikonomou
In this work we shall investigate the phenomenological implications of the constant-roll condition on a -Inflation theory of gravity. The latter theories are particularly promis…
Ghost-free non-local Gravity Cosmology
Shin'ichi Nojiri, S. D. Odintsov, V. K. Oikonomou
In this work we shall study ghost-free non-local gravity models. Firstly we shall demonstrate how the ghost degrees of freedom may occur in the non-local gravity mode…
Non-singular Bounce Cosmology from Lagrange Multiplier Gravity
Shin'ichi Nojiri, S. D. Odintsov, V. K. Oikonomou +1
In this work we study non-singular{ bounce cosmology} in the context of the Lagrange multiplier generalized gravity theory of gravity. We specify our study by using a specif…
Propagation of Gravitational Waves in Chern-Simons Axion Einstein Gravity
Shin'ichi Nojiri, S. D. Odintsov, V. K. Oikonomou +1
In this paper we shall investigate the propagation of gravitational waves in a flat Friedman-Robertson-Walker background, in the context of a string motivated corrected Einstein gr…
Viable Inflationary Models in a Ghost-free Gauss-Bonnet Theory of Gravity
Shin'ichi Nojiri, S. D. Odintsov, V. K. Oikonomou +2
In this work we investigate the inflationary phenomenological implications of a recently developed ghost-free Gauss-Bonnet theory of gravity. The resulting theory can be viewed as…
Unification of Inflation with Dark Energy in Gravity and Axion Dark Matter
S. D. Odintsov, V. K. Oikonomou
In this work we introduce an effective model of gravity containing a non-minimal coupling to the axion scalar field. The axion field is described by the misalignment model,…
-essence Gravity Inflation
S. Nojiri, S. D. Odintsov, V. K. Oikonomou
In this work we study a modified version of gravity in which higher order kinetic terms of a scalar field are added in the action of vacuum gravity. This type of theo…
Gravity Inflation with String-Corrected Axion Dark Matter
S. D. Odintsov, V. K. Oikonomou
It is quite well known for some time that string inspired axionic terms of the form , known also as Chern-Simons terms, do not affect the scalar perturbations and t…