16 papers
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…
-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…
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…