AST-718intermediate

CMB Polarization: Physical Mechanisms

CMB polarization is a faint directional pattern created when quadrupole variations in the radiation field scatter from free electrons. Polarization constrains reionization, primordial perturbations, gravitational lensing, neutrino physics, and possible inflationary gravitational waves.

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CMB Polarization: Physical Mechanisms

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AST-717CMB Polarization: Structures & Vocabulary→

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AST-719CMB Polarization: Observation, Measurement & Evidence→

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CMB polarization is a faint directional pattern created when quadrupole variations in the radiation field scatter from free electrons.

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Thomson scattering polarizes radiation when incoming intensity has an angular quadrupole.

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E-mode polarization and lensing-generated B modes have been detected.