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The idealization that the universe is statistically homogeneous and isotropic on sufficiently large spatial scales.
wp-physics-cosmological-principlenasa-big-bangeinstein-general-relativityEach relation below ends at this concept.
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Exact spatial homogeneity and isotropy lead to the FLRW family of spacetime geometries; the empirical cosmological principle is an idealization applied only on sufficiently large scales.
The target is a model, idealization, restricted ansatz, approximation scheme, phenomenological fit, or historical representation used for the source system or theory. It need not have a universal small error parameter and is not thereby a controlled limit or effective theory. The edge label and detail must identify the precise status.
nasa-big-bangeinstein-equation