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CMB polarization impact on cosmological constraints
- CMB polarization impact on cosmological constraints
- Das S.; Linder E.V.
- Ewha Authors
- Eric V. Linder
- Issue Date
- Journal Title
- Physical Review D - Particles, Fields, Gravitation and Cosmology
- Physical Review D - Particles, Fields, Gravitation and Cosmology vol. 86, no. 6
- SCIE; SCOPUS
- Document Type
- Cosmic microwave background (CMB) polarization encodes information not only on the early universe but also dark energy, neutrino mass, and gravity in the late universe through CMB lensing. Ground-based surveys, such as ACTpol, PolarBear, and SPTpol, significantly complement cosmological constraints from the Planck satellite, strengthening the CMB dark energy figure of merit and neutrino mass constraints by factors of 3-4. This changes the dark energy probe landscape. We evaluate the state of knowledge in 2017 from ongoing experiments including dark energy surveys (supernovae, weak lensing, galaxy clustering), fitting for dynamical dark energy, neutrino mass, and a modified gravitational growth index. Adding a modest strong lensing time delay survey improves those dark energy constraints by a further 32%, and an enhanced low-redshift supernova program improves them by 26%. © 2012 American Physical Society.
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