AST-721beginner

Cosmological Parameters from the CMB: Foundations

The CMB does not measure one cosmological number directly; its temperature, polarization, and lensing statistics jointly constrain a model's parameter combinations. CMB parameter fits define the high-redshift baseline used to test dark energy, neutrino mass, curvature, the Hubble tension, and departures from standard cosmology.

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Cosmological Parameters from the CMB: Foundations

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AST-720CMB Polarization: Advanced Connections→

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AST-722Cosmological Parameters from the CMB: Structures & Vocabulary→

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The CMB does not measure one cosmological number directly; its temperature, polarization, and lensing statistics jointly constrain a model's parameter combinations.

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Changing each parameter alters recombination physics, acoustic peak locations or heights, diffusion damping, gravitational lensing, or late-time projection from the sound horizon to the observer.

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