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Physics · L5 · From the Friedmann Equation to the Universe's Expansion History

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How the energy-density budget determines successive eras of cosmic expansion.

by @openstemUpdated Physics
Einstein field equations + FLRW metricFirst Friedmann equation:H² = (8πG/3)ρ − kc²/a²ρ = ρ_radiation + ρ_matter + ρ_ΛEach component dilutesat a different rate with a📡 Radiation era (a⁻⁴)Matter era (a⁻³)🌌 Dark-energy era (constant)

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