Recent advances in inflation

SD Odintsov, VK Oikonomou, I Giannakoudi… - Symmetry, 2023 - mdpi.com
We review recent trends in inflationary dynamics in the context of viable modified gravity
theories. After providing a general overview of the inflationary paradigm emphasizing on …

A refined Einstein–Gauss–Bonnet inflationary theoretical framework

VK Oikonomou - Classical and Quantum Gravity, 2021 - iopscience.iop.org
We provide a refined and much more simplified Einstein–Gauss–Bonnet inflationary
theoretical framework, which is compatible with the GW170817 observational constraints on …

Primordial gravitational waves predictions for GW170817-compatible Einstein–Gauss–Bonnet theory

VK Oikonomou - Astroparticle Physics, 2022 - Elsevier
In this work we shall calculate in detail the effect of an GW170817-compatible Einstein–
Gauss–Bonnet theory on the energy spectrum of the primordial gravitational waves. The …

Inflationary dynamics and swampland criteria for modified Gauss-Bonnet gravity compatible with GW170817

SD Odintsov, VK Oikonomou, FP Fronimos - Physical Review D, 2023 - APS
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 …

Propagation speed of gravitational wave in scalar–Einstein–Gauss-Bonnet gravity

S Nojiri, SD Odintsov - Nuclear Physics B, 2024 - Elsevier
The propagation speed of the gravitational wave in scalar–Einstein–Gauss-Bonnet (sEGB)
gravity is generally different from that of light. Using differential equation conditions for the …

Propagation of gravitational waves in Einstein-Gauss-Bonnet gravity for cosmological and spherically symmetric spacetimes

S Nojiri, SD Odintsov, VK Oikonomou - Physical Review D, 2024 - APS
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 …

Bottom-up reconstruction of viable GW170817 compatible Einstein–Gauss–Bonnet theories

VK Oikonomou, PD Katzanis… - Classical and Quantum …, 2022 - iopscience.iop.org
In this work we shall use a bottom-up approach for obtaining viable inflationary Einstein–
Gauss–Bonnet models which are also compatible with the GW170817 event. Specifically …

Construction of inflationary scenarios with the Gauss–Bonnet term and nonminimal coupling

EO Pozdeeva, SY Vernov - The European Physical Journal C, 2021 - Springer
Inflationary models with a scalar field nonminimally coupled both with the Ricci scalar and
with the Gauss–Bonnet term are studied. We propose the way of generalization of …

Gravitational collapse, primordial black hole, and gravitational wave in Einstein-Gauss-Bonnet theory with two scalar fields

S Nojiri, GGL Nashed - Physical Review D, 2024 - APS
In this paper, we investigate the gravitational collapse to form the black hole in the
accelerating, expanding Universe in the frame of Einstein-Gauss-Bonnet theory having two …

Propagation of gravitational waves in a dynamical wormhole background for two-scalar Einstein-Gauss-Bonnet theory

E Elizalde, S Nojiri, SD Odintsov… - Physics of the Dark …, 2024 - Elsevier
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-dynamical by …