26 citations · 89 across the 8 of their papers we have counts for
8 papers
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…
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…
Observational Constraints on Dynamical Dark Energy Models
Olga Avsajanishvili, Gennady Y. Chitov, Tina Kahniashvili +2
CDM models provide an alternative to the standard CDM paradigm, while being physically better motivated. These models lead to a time-dependent speed of sound for dark energy…
Mass varying neutrinos with different quintessence potentials
Sayan Mandal, Gennady Y. Chitov, Olga Avsajanishvili +2
The mass-varying neutrino scenario is analyzed for three trial quintessence potentials (Ferreira-Joyce, inverse exponential, and thawing oscillating). The neutrino mass is generate…
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…
The observational constraints on the flat CDM models
Olga Avsajanishvili, Yiwen Huang, Lado Samushia +1
Most dark energy models have the CDM as their limit, and if future observations constrain our universe to be close to CDM Bayesian arguments about the evidence and the fine-t…
Testing Dark Energy Models through Large Scale Structure
Olga Avsajanishvili, Lado Samushia, Natalia A. Arkhipova +1
We explore the scalar field quintessence freezing model of dark energy with the inverse Ratra-Peebles potential. We study the cosmic expansion and the large scale structure growth…
Growth Rate in the Dynamical Dark Energy Models
Olga Avsajanishvili, Natalia A. Arkhipova, Lado Samushia +1
Dark Energy models with slowly-rolling cosmological scalar field provide a popular alternative to the standard, time-independent cosmological constant model. We study simultaneous…