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Neutrino masses and beyond-Lambda CDM cosmology with LSST and future CMB experiments

Author(s): Mishra-Sharma, Siddharth; Alonso, David; Dunkley, Jo

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Abstract: Cosmological measurements over the next decade will enable us to shed light on the content and evolution of the Universe. Complementary measurements of the cosmic microwave background (CMB) and baryon acoustic oscillations are expected to allow an indirect determination of the sum of neutrino masses, within the framework of the flat Lambda CDM model. However, possible deviations from.CDM such as a nonzero cosmological curvature or a dark energy equation of state with w not equal -1 would leave similar imprints on the expansion rate of the Universe and clustering of matter. We show how future CMB measurements can be combined with late-time measurements of galaxy clustering and cosmic shear from the Large Synoptic Survey Telescope to alleviate this degeneracy. Together, they are projected to reduce the uncertainty on the neutrino mass sum to 30 meV within this more general cosmological model. Achieving a 3s measurement of the minimal 60 meV mass sum (or 4 sigma assuming w = -1) will require a fivefold improved measurement of the optical depth to reionization, obtainable through a large-scale CMB polarization measurement.
Publication Date: 15-Jun-2018
Electronic Publication Date: 29-Jun-2018
Citation: Mishra-Sharma, Siddharth, Alonso, David, Dunkley, Joanna. (2018). Neutrino masses and beyond-Lambda CDM cosmology with LSST and future CMB experiments. PHYSICAL REVIEW D, 97 (10.1103/PhysRevD.97.123544
DOI: doi:10.1103/PhysRevD.97.123544
ISSN: 2470-0010
EISSN: 2470-0029
Type of Material: Journal Article
Journal/Proceeding Title: PHYSICAL REVIEW D
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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