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Canonical Scalar Field Inflation with String and -Corrections
S. D. Odintsov, V. K. Oikonomou, F. P. Fronimos
Assuming that a scalar field controls the inflationary era, we examine the combined effects of string and gravity corrections on the inflationary dynamics of canonical scala…
Non-minimally Coupled Einstein-Gauss-Bonnet Gravity with Massless Gravitons: The Constant-roll Case
V. K. Oikonomou, F. P. Fronimos
In this letter we study the behavior of non-minimally coupled Einstein-Gauss-Bonnet gravity theories with the constant-roll condition. Recalling the results of the striking GW17081…
Unification of a Bounce with a Viable Dark Energy Era in Gauss-Bonnet Gravity
S. D. Odintsov, V. K Oikonomou, F. P. Fronimos +1
In this work we shall demonstrate that it is possible to describe in a unified way a primordial bounce with the dark energy era, in the context of Gauss-Bonnet modified gravity. Pa…
From a Bounce to the Dark Energy Era with Gravity
S. D. Odintsov, V. K. Oikonomou, Tanmoy Paul
In this work we consider a cosmological scenario in which the Universe contracts initially having a bouncing-like behavior, and accordingly after it bounces off, it decelerates fol…
Bottom-up reconstruction of non-singular bounce in F(R) gravity from observational indices
S. D. Odintsov, V. K. Oikonomou, Tanmoy Paul
We apply the bottom-up reconstruction technique in the context of bouncing cosmology in F(R) gravity, where the starting point is a suitable ansatz of observable quantity (like spe…
Unifying Holographic Inflation with Holographic Dark Energy: a Covariant Approach
Shinichi Nojiri, S. D. Odintsov, V. K. Oikonomou +1
In the present paper, we use the holographic approach to describe the early-time acceleration and the late-time acceleration eras of our Universe in a unified manner. Such ``hologr…
Inflationary Attractors in Gravity
S. D. Odintsov, V. K. Oikonomou
In this letter we shall demonstrate that the viable gravities can be classified mainly into two classes of inflationary attractors, either the attractors or the -at…
Gravity -Essence Late-time Phenomenology
S. D. Odintsov, V. K. Oikonomou, F. P. Fronimos
In this work we shall study the late-time behavior of -Essence gravity without scalar potential, in the presence of matter and radiation perfect fluids. We quantify the l…
Swampland Implications of GW170817-compatible Einstein-Gauss-Bonnet Gravity
S. D. Odintsov, V. K. Oikonomou
We revisit the Einstein-Gauss-Bonnet theory in view of the GW170817 event, which compels that the gravitational wave speed is equal to in natural units. We use an alterna…
Aspects of Axion Gravity
S. D. Odintsov, V. K. Oikonomou
We provide a compact review on recent developments on axion gravity. The axion field is a string theory originating theoretical particle that is a perfect candidate for low-…
Extended matter bounce scenario in ghost free gravity compatible with GW170817
E. Elizalde, S. D. Odintsov, V. K. Oikonomou +1
In the context of a ghost free model, an extended matter bounce scenario is studied where the form of the scale factor is given by . The g…
Propagation of Gravitational Waves in Chern-Simons Axion Gravity
Shin'ichi Nojiri, S. D. Odintsov, V. K. Oikonomou +1
In this paper we shall study the evolution of cosmological gravitational waves in the context of Chern-Simons axion gravity. In the case of Chern-Simons axion gravity…
Geometric Inflation and Dark Energy with Axion Gravity
S. D. Odintsov, V. K. Oikonomou
We present a model of gravity in the presence of a string theory motivated misalignment axion like particle materialized in terms of a canonical scalar field minimally coupl…