2.7k citations · 7.8k across the 116 of their papers we have counts for
103 papers
ACT-compatible Inflation in Scalar Field Coupled Gravity
Shin'ichi Nojiri, S. D. Odintsov, V. K. Oikonomou
In this work, we construct models compatible with ACT constraints on inflation in the framework of gravity, with gravity coupled to a scalar fiel…
String-inspired Gauss-Bonnet Gravity Inflation and ACT
S. D. Odintsov, V. K. Oikonomou, Pyotr Tsyba +2
In this article we present a systematic observational verification of the ghost-free string-inspired model, where the Gauss-Bonnet invariant is non-minimally cou…
Ghost-free non-local Gravity Compatible with ACT
Shin'ichi Nojiri, S. D. Odintsov, V. K. Oikonomou
We confront the ghost-free non-local gravity theories with the latest Atacama Cosmology Telescope (ACT) constraints on the spectral index of the scalar perturbations and the…
Viable f(R) Scenarios Unifying Inflation with Realistic Dynamical Dark Energy
S. D. Odintsov, V. K. Oikonomou, G. S. Sharov
Two gravity models are tested on the basis of their viability during all stages of cosmological evolution. It is shown that these models can describe both the early-time inf…
A Remedy of the Trans-Planckian Censorship Problem with Smooth Slow-roll to Power-law Inflation Transitions in Scalar Field Theory
S. D. Odintsov, V. K. Oikonomou
It is known that if the standard slow-roll inflation is followed by a power-law inflationary regime, then the trans-Planckian modes may be safely be contained in the Hubble horizon…
General Scalar Field Inflation ACT Attractors: Utilizing the relation
V. K. Oikonomou
The ACT data have severely constrained the single scalar field models. Known models of inflation, like the Starobinsky model, the Higgs model and the -attractors are at least $2…
-corrected Tachyon Scalar Field Inflation, the ACT Data, and Phantom Transition
S. D. Odintsov, V. K. Oikonomou
Phantom divide line transitions are not possible in the context of single scalar field scalar-tensor theories. In this article we study a combined framework of a tachyonic minimall…
Power-law Gravity as Deformations to Starobinsky Inflation in View of ACT
S. D. Odintsov, V. K. Oikonomou
In this work we aim to provide a new parametrization of power-law gravity inflation framework in the Jordan frame. It is known in the literature that the power-law gr…
Confronting Rainbow-deformed Gravity with the ACT Data
S. D. Odintsov, V. K. Oikonomou
In this work we examine a theoretical scenario which combines two fundamental theoretical proposals for the early Universe and a possible evolution for the early post-inflationary…
Solving the Trans-Planckian Censorship Problem with a Power-law Tail in Inflation: A Dynamical System Approach
S. D. Odintsov, V. K. Oikonomou, Eleni I. Manouri +1
In this work we elaborate on solving the trans-Planckian censorship problem of standard slow-roll inflation by using a power-law inflationary tail generated by a scalar field with…
Strong Gravity Effects on -corrected Single Scalar Field Inflation and Compatibility with the ACT Data
V. K. Oikonomou
In this work we introduce the rescaled -corrected minimally coupled scalar field theory, a theory that contains minimal quantum corrections of the single scalar fiel…
GW170817 Viable Einstein-Gauss-Bonnet Inflation Compatible with the Atacama Cosmology Telescope Data
S. D. Odintsov, V. K. Oikonomou
In this work we investigate several Einstein-Gauss-Bonnet models that are compatible with the GW170817 event, the Atacama Cosmology Telescope data and the BICEP/Keck updated Planck…
Effective Equation of State Oscillations at Matter-Radiation Equality and Primordial Gravitational Waves
S. D. Odintsov, V. K. Oikonomou
The theory controlling the Universe's evolution in the classical regime has to be motivated by particle physics reasoning and should also generate inflation and dark energy eras in…
Phantom Crossing and Oscillating Dark Energy with Gravity
Shin'ichi Nojiri, S. D. Odintsov, V. K. Oikonomou
In this work, we shall consider how a dynamical oscillating and phantom crossing dark energy era can be realized in the context of gravity. We approach the topic from a theo…
Dynamical Dark Energy from Gravity Models Unifying Inflation with Dark Energy: Confronting the Latest Observational Data
S. D. Odintsov, V. K. Oikonomou, G. S. Sharov
A class of viable gravity models which can provide a unified description of inflation with the dark energy era is confronted with the latest observational data on the dark e…
A Power-law Inflation Tail for the Standard -Inflation and the Trans-Planckian Censorship Conjecture
S. D. Odintsov, V. K. Oikonomou
The conceptual problems of the standard slow-roll inflationary scenario include the Trans-Planckian Censorship Conjecture issue, which severely restricts the tensor-to-scalar ratio…
Einstein-Gauss-Bonnet Cosmology Confronted with Observations
S. D. Odintsov, V. K. Oikonomou, German S. Sharov
Several models within the framework of Einstein-Gauss-Bonnet gravities are considered with regard their late-time phenomenological viability. The models contain a non-minimally cou…
Propagation of Gravitational Waves in a Dynamical Wormhole Background for Two-scalar Einstein-Gauss-Bonnet Theory
E. Elizalde, Shin'ichi Nojiri, S. D. Odintsov +1
In this work, we propose a model of Einstein--Gauss-Bonnet gravity coupled with two scalar fields. The two scalar fields are considered to be ``frozen'' or they become non-dynamica…
Propagation of Gravitational Waves in Einstein--Gauss-Bonnet Gravity for Cosmological and Spherically Symmetric Spacetimes
Shin'ichi Nojiri, S. D. Odintsov, V. K. Oikonomou
In this work, we examine the propagation of gravitational waves in cosmological and astrophysical spacetimes in the context of Einstein--Gauss-Bonnet gravity, in view of the GW1708…
Finite-time Cosmological Singularities and the Possible Fate of the Universe
Jaume de Haro, Shin'ichi Nojiri, S. D. Odintsov +2
Singularities in any physical theory are either remarkable indicators of the unknown underlying fundamental theory, or indicate a change in the description of the physical reality.…
Early Dark Energy with Power-law F(R) Gravity
Sergei D. Odintsov, V. K. Oikonomou, German S. Sharov
We study a power-law gravity with an early dark energy term, that can describe both the early-time and the late-time acceleration of the Universe. We confront this scenario…
Inflationary Attractors Predictions for Static Neutron Stars in the Mass-Gap Region
S. D. Odintsov, V. K. Oikonomou
In this work we study static neutron stars in the context of several inflationary models which are popular in cosmology. These inflationary models are non-minimally coupled scalar…
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…
Formalizing Anisotropic Inflation in Modified Gravity
S. Nojiri, S. D. Odintsov, V. K. Oikonomou +1
Motivated by the fact that the pre-inflationary era may evolve in an exotic way, in this work we formalize anisotropic evolution in the context of modified gravity, focusing on pre…