142 citations · 446 across the 12 of their papers we have counts for
12 papers
Strong Einstein-Hilbert Gravity Inflation and ACT Phenomenology
V. K. Oikonomou, Eleni I. Manouri, Georgios Konstantellos
In this work we study rescaled effective single scalar field theories, and we confront these with the ACT constraint on the spectral index of the scalar primordial perturbations an…
Effects of a Pre-inflationary de Sitter Bounce on the Primordial Gravitational Waves in Gravity Theories
V. K. Oikonomou
In this work we examine the effects of a pre-inflationary de Sitter bounce on the energy spectrum of the primordial gravitational waves. Specifically we assume that the Universe is…
A Panorama of Viable Gravity Dark Energy Models
V. K. Oikonomou, Ifigeneia Giannakoudi
In this work we shall study the late-time dynamics of several gravity models. By appropriately expressing the field equations in terms of the redshift and of a statefinder f…
Quantum Corrected Scalar Field Inflation
V. K. Oikonomou, Ifigeneia Giannakoudi
String theory enjoys an elevated role among quantum gravity theories, since it seems to be the most consistent UV completion of general relativity and the Standard Model. However,…
Power-Law Gravity Corrected Canonical Scalar Field Inflation
V. K. Oikonomou
The effective inflationary Lagrangian is a prominent challenge for theoretical cosmologists, since it may contain imprints of the quantum epoch. In view of the fact that higher ord…
Generalizing the Constant-roll Condition in Scalar Inflation
V. K. Oikonomou
In this work we generalize the constant-roll condition for minimally coupled canonical scalar field inflation. Particularly, we shall assume that the scalar field satisfies the con…
Rescaled Einstein-Hilbert Gravity: Inflation and the Swampland Criteria
V. K. Oikonomou, Ifigeneia Giannakoudi, Achilles Gitsis +1
In this work we shall study a class of gravity models which during the inflationary era, which is the large curvature regime, result to an effective inflationary Lagrangia…
Unifying of Inflation with Early and Late Dark Energy Epochs in Axion Gravity
V. K. Oikonomou
We provide a theoretical model of gravity in which it is possible to describe in a unified way inflation, an early and a late dark energy era, in the presence of a light axi…
Rescaled Einstein-Hilbert Gravity from Gravity: Inflation, Dark Energy and the Swampland Criteria
V. K. Oikonomou
We consider a class of exponential models of gravity, in the presence of a canonical scalar field, for which at early times the effective Lagrangian of the theory becomes th…
Exponential Inflation with Gravity
V. K. Oikonomou
In this paper we shall consider an exponential inflationary model in the context of vacuum gravity. By using well-known reconstruction techniques, we shall investigate which…
Aspects of Late-time Evolution in Mimetic Gravity
V. K. Oikonomou
We demonstrate how to describe in an unified way early and late-time acceleration in the context of mimetic gravity. As we show, an exponential gravity model has appe…
Gauss-Bonnet Cosmology Unifying Late and Early-time Acceleration Eras with Intermediate Eras
V. K. Oikonomou
In this paper we demonstrate that with vacuum gravity it is possible to describe the unification of late and early-time acceleration eras with the radiation and matter domin…