217 citations · 591 across the 25 of their papers we have counts for
25 papers
Recent Advances on Inflation
S. D. Odintsov, V. K. Oikonomou, I. Giannakoudi +2
We review recent trends on inflationary dynamics in the context of viable modified gravity theories. After providing a general overview of the inflationary paradigm emphasizing on…
Inflationary Dynamics and Swampland Criteria for Modified Gauss-Bonnet Gravity Compatible with GW170817
S. D. Odintsov, V. K. Oikonomou, F. P. Fronimos
In this article we present an alternative formalism for the inflationary phenomenology of rescaled Einstein-Gauss-Bonnet models which are in agreement with the GW170817 event. By c…
Kinetic Axion Dark Matter in String Corrected Gravity
V. K. Oikonomou, F. P. Fronimos, Pyotr Tsyba +1
Under the main assumption that the axion scalar field mainly composes the dark matter in the Universe, in this paper we shall extend the formalism of kinetic axion gravity to…
Inflationary phenomenology of non-minimally coupled Einstein-Chern-Simons gravity
F. P. Fronimos, S. A. Venikoudis
In this work we investigate the inflationary era in the presence of a canonical scalar field and Chern-Simons parity violating corrections. It was also assumed that a non minimal c…
Swampland criteria for rescaled Einstein-Hilbert gravity with string corrections
Achilles Gitsis, Konstantinos-Rafail Revis, S. A. Venikoudis +1
In this work we examine the Swampland criteria for a specific class of rescaled gravitational models, that are capable of unifying the primordial era of the Universe with th…
Reheating era in Gauss-Bonnet theories of gravity compatible with the GW170817 event
S. A. Venikoudis, F. P. Fronimos
In the present article we showcase how the reheating era can be described properly in the context of Einstein-Gauss-Bonnet gravity assuming that the primordial gravitational waves…
Late-time Cosmology of scalar field assisted gravity
S. A. Venikoudis, K. V. Fasoulakos, F. P. Fronimos
In this work we present the late-time behaviour of the Universe in the context of Einstein-Gauss-Bonnet gravitational theory. The theory involves a scalar field, which represents l…
Inflation with exotic kinetic terms in Einstein-Chern-Simons gravity
F. P. Fronimos, S. A. Venikoudis
An alternative scenario about the phenomenology of primordial Universe is k-inflation. According to this concept, inflation can be achieved by nonstandard kinetic term of scalar fi…
Kinetic Coupling Corrected Einstein-Gauss-Bonnet Gravity Late-Time Phenomenology
Fotis Fronimos
In this short note we present the dynamics of a general scalar-tensor model, and in particular a scalar Einstein-Gauss-Bonnet model with a non-minimal coupling between gravity and…
Generalized Horndeski-Like Einstein Gauss-Bonnet Inflation with Massless Primordial Gravitons
V. K. Oikonomou, F. P. Fronimos
In this work we shall introduce a theoretical framework comprised by a non-minimal coupled canonical scalar field, a non-minimal coupling to the Gauss-Bonnet invariant and a non-mi…
Quantitative Predictions for Gravity Primordial Gravitational Waves
S. D. Odintsov, V. K. Oikonomou, F. P. Fronimos
In this work we shall develop a quantitative approach for extracting predictions on the primordial gravitational waves energy spectrum for gravity. We shall consider two dis…
Inflation with Gauss-Bonnet and Chern-Simons higher-curvature-corrections in the view of GW170817
S. A. Venikoudis, F. P. Fronimos
Inflationary era of our Universe can be characterized as semi-classical because it can be described in the context of four-dimensional Einsteins's gravity involving quantum correct…
Logarithmic corrected Einstein-Gauss-Bonnet inflation compatible with GW170817
S. A. Venikoudis, F. P. Fronimos
In this paper we investigate the inflationary phenomenology of an Einstein-Gauss-Bonnet theory with the extension of a logarithmic modified gravity, compatible with the GW17…
Late-Time Cosmology of Scalar-Coupled Gravity
S. D. Odintsov, V. K. Oikonomou, F. P. Fronimos
In this work by using a numerical analysis, we investigate in a quantitative way the late-time dynamics of scalar coupled gravity. Particularly, we consider a Ga…
-Inflation-corrected Einstein-Gauss-Bonnet Gravity with Massless Primordial Gravitons
S. D. Odintsov, V. K. Oikonomou, F. P. Fronimos
In the present paper, we study the inflationary phenomenology of a -inflation corrected Einstein-Gauss-Bonnet theory. Non-canonical kinetic terms are known for producing Jean in…
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…
Gravity Phase Space in the Presence of Thermal Effects
V. K. Oikonomou, F. P. Fronimos, N. Th. Chatzarakis
In this paper, we shall consider gravity and its cosmological implications, when an extra matter term generated by thermal effects is added by hand in the Lagrangian. We for…
GW170817-compatible Constant-roll Einstein-Gauss-Bonnet Inflation and Non-Gaussianities
S. D. Odintsov, V. K. Oikonomou, F. P. Fronimos +1
In this paper we investigate the inflationary phenomenology of an Einstein-Gauss-Bonnet theory compatible with the GW170817 event, by imposing the constant-roll evolution on the sc…
A Nearly Massless Graviton in Einstein-Gauss-Bonnet Inflation with Linear Coupling Implies Constant-roll for the Scalar Field
V. K. Oikonomou, F. P. Fronimos
The striking GW170817 event indicated that the graviton is nearly massless, since the gamma rays emitted from the two neutron stars merging arrived almost simultaneously with the g…
Non-Minimally Coupled Einstein Gauss Bonnet Inflation Phenomenology in View of GW170817
S. D. Odintsov, V. K. Oikonomou, F. P. Fronimos
We study the inflationary phenomenology of a non-minimally coupled Einstein Gauss-Bonnet gravity theory, in the presence of a scalar potential, under the condition that the gravita…
Reviving non-Minimal Horndeski-like Theories after GW170817: Kinetic Coupling Corrected Einstein-Gauss-Bonnet Inflation
V. K. Oikonomou, F. P. Fronimos
After the recent GW170817 event of the two neutron stars merging, many string corrected cosmological theories confronted the non-viability peril. This was due to the fact that most…
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…