Constraints on a Bianchi type I spacetime extension of the standard $Λ$CDM model
Ozgur Akarsu; Suresh Kumar; Shivani Sharma; Luigi Tedesco · 2019 · arXiv
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Abstract (excerpt)
We consider the simplest anisotropic generalization, as a correction, to the standard $Λ$CDM model, by replacing the spatially flat Robertson-Walker metric by the Bianchi type-I metric, which brings in a new term $Ω_{σ0}a^{-6}$ (mimicking the stiff fluid) in the average expansion rate $H(a)$ of the Universe. From Hubble and Pantheon data, relevant to the late Universe ($z\lesssim 2.4$), we obtain the constraint $Ω_{\sigma0}\lesssim10^{-3}$, in line with the model-independent constraints. When the baryonic acoustic oscillations and cosmic microwave background (CMB) data are included, the constr
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Metadata source: arXiv