 Spatially flat FLRW metric

ID: spatially-flat-flrw-metric

Codex  0 Created 2026-09-24 Updated 2026-09-24

In Cartesian comoving coordinates and signature

(-, +, +, +)

, a spatially flat FLRW universe has

d s^{2} = - c^{2} d t^{2} + a^{2} (t) (d x^{2} + d y^{2} + d z^{2}) .

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