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Cosmic microwave background polarization encodes information not only on theearly universe but also dark energy, neutrino mass, and gravity in the lateuniverse through CMB lensing. Ground based surveys such as ACTpol, PolarBear,SPTpol significantly complement cosmological constraints from the Plancksatellite, strengthening the CMB dark energy figure of merit and neutrino massconstraints by factors of 3-4. This changes the dark energy probe landscape. Weevaluate the state of knowledge in 2017 from ongoing experiments including darkenergy surveys (supernovae, weak lensing, galaxy clustering), fitting fordynamical dark energy, neutrino mass, and a modified gravitational growthindex. Adding a modest strong lensing time delay survey improves those darkenergy constraints by a further 32%, and an enhanced low redshift supernovaprogram improves them by 26%.

By Dawn's Early Light: CMB Polarization Impact on Cosmological Constraints