Perturbations in Bianchi-V Spacetimes with Varying L, G and Viscous Fluids

Abebe A., Alfedeel A. H. A., Sofuoglu D., Hassan E. I., Tiwari R. K.

UNIVERSE, cilt.9, sa.61, ss.1-19, 2023 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 9 Sayı: 61
  • Basım Tarihi: 2023
  • Doi Numarası: 10.3390/universe9020061
  • Dergi Adı: UNIVERSE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, INSPEC, Directory of Open Access Journals
  • Sayfa Sayıları: ss.1-19
  • İstanbul Üniversitesi Adresli: Evet

Özet

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.