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Astronomy · L5 · FLRW Cosmology: Expansion and Energy Content

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Flowchart of FLRW cosmological model components and their effect on the expansion rate.

by @openstemUpdated Astronomy
FLRW Metric: ds² = −c²dt² + a²(t)dl²Friedmann Equation: H² = 8πGρ/3 − kc²/a² + Λc²/3Matter: ρ_m ∝ a⁻³ → decelerating expansionRadiation: ρ_r ∝ a⁻⁴ → fast deceleration earlyCosmological Constant Λ → exponential expansionCurvature k: open/flat/closed geometryΛCDM: matter + Λ → late-time accelerationConsistent with CMB + SN Ia + BAO data

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