Perturbations in Bianchi-V Spacetimes with Varying L, G and Viscous Fluids
UNIVERSE, vol.9, no.61, pp.1-19, 2023 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 9 Issue: 61
- Publication Date: 2023
- Doi Number: 10.3390/universe9020061
- Journal Name: UNIVERSE
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, INSPEC, Directory of Open Access Journals
- Page Numbers: pp.1-19
- Istanbul University Affiliated: Yes
Abstract
As a follow-up of a recent article in which we investigated the cosmological background expansion history of the universe in Bianchi type-V cosmological models with bulk viscous fluid and evolving cosmological lambda and Newtonian G parameters, we study the evolution of the cosmological perturbations in the current work. In particular, we analyse the evolution of the viscous matter over-density that leads to formation of large-scale structures in the Bianchi-V model, and compare the results with standard lambda CDM solutions. Our results suggest that introducing viscous fluid in the background described by Bianchi-V geometry with evolving lambda and G amplifies the structure-growth rate.