Isotropization of N-component orthogonal fluid within the framework of Einstein field equations

Yılmaz A. O., Çil B., Kara E., Güdekli E.

New Astronomy, vol.94, 2022 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 94
  • Publication Date: 2022
  • Doi Number: 10.1016/j.newast.2022.101792
  • Journal Name: New Astronomy
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Communication Abstracts, INSPEC, Metadex, Civil Engineering Abstracts
  • Keywords: Cosmology, Isotropization, Bianchi, COSMOLOGICAL MODELS
  • Istanbul University Affiliated: Yes

Abstract

© 2022 Elsevier B.V.In this study, we build up a general formalism for tilted N-component fluid form to investigate the isotropization features of the Bianchi-type models excluding Bianchi-IX. We applied this formalism to Bianchi type I and V models analytically and numerically using the metric approach of Einstein field equations. It is found that only the stiff fluid for Bianchi I model does not isotropize, in the absence of cosmological constant. Other Bianchi type I and V models become isotropic regardless of the type of the fluid or how much component it has. The result does not change with the existence of a cosmological constant.