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A homogeneous and isotropic spacetime geometry with a time-dependent scale factor and constant-curvature spatial slices.
wp-physics-flrw-spacetimenasa-big-bangeinstein-equationEach relation below ends at this concept.
This is an authored directed relation from the source endpoint to the target endpoint.
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-equationThis is an authored directed relation from the source endpoint to the target endpoint.
FLRW geometries model homogeneous and isotropic universes in general relativity.
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.
einstein-general-relativitynasa-big-bangEach relation below starts at this concept.
This is an authored directed relation from the source endpoint to the target endpoint.
Substituting the homogeneous and isotropic FLRW metric and perfect-fluid stress–energy into Einstein’s equation yields the Friedmann equations.
Record a genuine theorem implication that is not part of the target definition; these edges may point toward a weaker structure.
einstein-equationnasa-big-bangtong-grwp-physics-flrw-spacetimewp-physics-friedmann-equationsThis is an authored directed relation from the source endpoint to the target endpoint.
The standard cosmological model uses a perturbed FLRW spacetime as its background geometry together with specified matter, radiation, dark-matter, and cosmological-constant sectors.
The source supplies a substantive formal ingredient, dynamical sector, law, field content, or mechanism of the target theoretical framework.
nasa-big-bangeinstein-equationtong-grwp-physics-flrw-spacetime