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- Title
Accelerately Expanding Cosmologies in ๐(๐น, ๐ฑ, ๐ฟ) Theory.
- Authors
ERASLAN, Erkan; ULU DOฤRU, Melis
- Abstract
In this study, beginning and today expansion of universe are viewed in ๐(๐ , ๐ท, ๐) gravity. Field equations and their solutions of Friedmann-Lemaรฎtre-Robertson-Walker cosmologies with perfect fluid are obtained by considering ๐(๐ , ฮฆ, ๐) = ๐0๐ + ๐1๐๐ - ๐(๐ท) model. Validity of both ๐(๐ , ๐ท, ๐) gravity and ๐(๐ , ๐ท, ๐) = ๐0๐ + ๐1๐๐ - ๐(ฮฆ) model for non-static space-time geometries is discussed by making use of the obtained matter dynamics results such as pressure and energy density. It is seen that in all obtained solutions by taking into account early and late period expansion, ๐ function is a constant. This indicates that ๐(๐ , ฮฆ, ๐) function is a first-order dependent function of Ricci scalar. When ๐(๐ , ๐ท, ๐) = ๐0๐ + ๐1๐๐ - ๐(๐ท) model is considered together, it is understood that the obtained solutions could be reduced to ฮ - ๐ถ๐ท๐ model for ๐(๐ ) gravity in limits of ๐ท โ 0 and ๐ โ 0. The fact that the obtained results agree with expected situations supports. So, ๐(๐ , ๐ท, ๐) theory is a consistent theory of gravity.
- Subjects
ENERGY density; FIELD theory (Physics); GRAVITY; RICCI flow
- Publication
Journal of Natural & Applied Sciences, 2023, Vol 27, Issue 2, p331
- ISSN
1300-7688
- Publication type
Article
- DOI
10.19113/sdufenbed.1256169