planck-2018-bayesian-mcmc-parameters
IN premise — summaries/2026/08/24/wiki-Bayesian_inference-chunk-5.md
Created 2026-08-25T02:58:44+00:00
The Planck 2018 cosmological parameter constraints (H₀, Ω_b, Ω_c, σ₈, n_s, A_s) were derived via Bayesian MCMC inference.
Summary
The standard numbers describing our universe's expansion, composition, and initial structure were pulled from Planck satellite data using a probabilistic fitting method rather than a single best-guess calculation. This matters because those values carry probability distributions and depend on the specific model assumptions built into the analysis, so any downstream reasoning that uses them inherits that uncertainty and framework instead of treating the numbers as hard, model-free facts.