The nonlinear patterns of the cosmic anisotropy: the spatially flat perfect fluid universes

Autor:	Leandro G. Gomes
Rok vydání:	2021
Předmět:	Physics Nonlinear system COSMIC cancer database Classical mechanics Physics and Astronomy (miscellaneous) Perfect fluid Anisotropy
Zdroj:	Classical and Quantum Gravity. 39:027001
ISSN:	1361-6382 0264-9381
Popis:	In this manuscript, we investigate the patterns of the cosmological anisotropy in the spatially flat Bianchi models filled with a perfect fluid. We analyse the factor 1 + Δ R , the ratio of the Hubble parameter in the anisotropic model over its isotropic counterpart. In general, Δ R starts to deviate significantly from zero at a specific redshift z A , which depends on the type of the fluid and the value of the anisotropy magnitude. We also show that the deceleration and the jerk along the principal directions of the expansion tensor are constrained by simple algebraic equations that do not depend on the type of matter present. These characteristic patterns form a valuable framework to probe the cosmological anisotropy in the late-time universe.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2ddf821fd65acb8d498dd4a624f6dcad https://doi.org/10.1088/1361-6382/ac3ae1 Zobrazit plný text záznamu