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Loop Quantum Cosmology Corrected Gauss-Bonnet Singular Cosmology
K. Kleidis, V. K. Oikonomou
In this work we investigate which Loop Quantum Cosmology corrected Gauss-Bonnet gravity can realize two singular cosmological scenarios, the intermediate inflation…
The Early-time Cosmology with Stiff Era from Modified Gravity
S. D. Odintsov, V. K. Oikonomou
In this work, we shall incorporate a stiff era in the Universe's evolution in the context of gravity. After deriving the vacuum gravity, which may realize a stiff evo…
Autonomous Dynamical System Approach for Gravity
S. D. Odintsov, V. K. Oikonomou
In this work we shall investigate the cosmological dynamical system of gravity, by constructing it in such a way so that it is rendered autonomous. We shall study the vacuum…
Ghost-Free Gravity with Lagrange Multiplier Constraint
S. Nojiri, S. D. Odintsov, V. K. Oikonomou
We propose two new versions of ghost-free generalized gravity with Lagrange multiplier constraint. The first version of such theory for a particular degenerate choice of the…
Reconstruction of Slow-roll Gravity Inflation from the Observational Indices
S. D. Odintsov, V. K. Oikonomou
In this work, we introduce a bottom-up gravity reconstruction technique, in which we fix the observational indices and we seek for the gravity which may realize them.…
Constant-roll Inflation in Teleparallel Gravity
A. Awad, W. El Hanafy, G. G. L. Nashed +2
We investigate in detail the implications of the constant-roll condition on the inflationary era of a scalar field coupled to a teleparallel gravity. The resulting cosmologi…
A Smooth Constant-Roll to a Slow-Roll Modular Inflation Transition
V. K. Oikonomou
In this work, we investigate how a smooth transition from a constant-roll to a slow-roll inflationary era may be realized, in the context of a canonical scalar field theory. We stu…
Unification of Constant-roll Inflation and Dark Energy with Logarithmic -corrected and Exponential Gravity
S. D. Odintsov, V. K. Oikonomou, L. Sebastiani
In this paper we investigate how to describe in a unified way a constant-roll inflationary era with a dark energy era, by using the theoretical framework of gravity. To this…
Phase Space Analysis of the Accelerating Multi-fluid Universe
S. D. Odintsov, V. K. Oikonomou, Petr V. Tretyakov
We study in detail the phase space of a Friedmann-Robertson-Walker Universe filled with various cosmological fluids which may or may not interact. We use various expressions for th…
Modified Gravity Theories on a Nutshell: Inflation, Bounce and Late-time Evolution
S. Nojiri, S. D. Odintsov, V. K. Oikonomou
We systematically review some standard issues and also the latest developments of modified gravity in cosmology, emphasizing on inflation, bouncing cosmology and late-time accelera…
Inflationary Dynamics with a Smooth Slow-Roll to Constant-Roll Era Transition
S. D. Odintsov, V. K. Oikonomou
In this paper we investigate the implications of having a varying second slow-roll index on the canonical scalar field inflationary dynamics. We shall be interested in cases that t…
Constant-roll Inflation in Gravity
S. Nojiri, S. D. Odintsov, V. K. Oikonomou
We propose the study of constant-roll inflation in gravity. We use two different approaches, one that relates an gravity to well known scalar models of constant-roll…
Inflation with a Smooth Constant-Roll to Constant-Roll Era Transition
S. D. Odintsov, V. K. Oikonomou
In this paper we study canonical scalar field models with a varying second slow-roll parameter, that allow transitions between constant-roll eras. In the models with two constant-r…