3 papers
astro-ph.CO2026
Background dynamics and observational constraints of flat and non-flat CDM models from and DESI DR2 BAO measurements
Olga Avsajanishvili
In this work, we present comprehensive observational constraints on the time-varying vacuum Lambda(t)CDM cosmology using the latest baryon acoustic oscillation (BAO) data from Dark…
astro-ph.CO2025
The cosmological Mass Varying Neutrino model in the late universe
Olga Avsajanishvili
The cosmological Mass Varying Neutrino (MaVaN) model is considered, where the interaction between a fermionic field and a scalar field with a Ratra-Peebles potential via a Yukawa c…
astro-ph.CO2019
Cosmological models of dark energy: theory and observations
Olga Avsajanishvili
We investigated the evolution of the background expansion and the growth rate of the matter density fluctuations in the scalar field CDM Ratra-Peebles model. We constrained the…