Skip to main content

Towards a cosmological neutrino mass detection

Author(s): Allison, R; Caucal, P; Calabrese, E; Dunkley, Jo; Louis, T

To refer to this page use:
Abstract: Future cosmological measurements should enable the sum of neutrino masses to be determined indirectly through their effects on the expansion rate of the Universe and the clustering of matter. We consider prospects for the gravitationally lensed cosmic microwave background (CMB) anisotropies and baryon acoustic oscillations (BAOs) in the galaxy distribution, examining how the projected uncertainty of approximate to 15 meV on the neutrino mass sum (a 4 sigma detection of the minimal mass) might be reached over the next decade. The current 1 sigma uncertainty of approximate to 103 meV (Planck-2015 + BAO-15) will be improved by upcoming “Stage-3” (S3) CMB experiments (S3 + BAO-15: 44 meV), then upcoming BAO measurements (S3 + DESI: 22 meV), and planned next-generation “ Stage 4” (S4) CMB experiments (S4 + DESI: 15-19 meV, depending on angular range). An improved optical depth measurement is important: the projected neutrino mass uncertainty increases to 26 meV if S4 is limited to l > 20 and combined with current large-scale polarization data. Looking beyond Lambda CDM, including curvature uncertainty increases the forecast mass error by approximate to 50% for S4 + DESI, and more than doubles the error with a two-parameter dark-energy equation of state. Complementary low-redshift probes including galaxy lensing will play a role in distinguishing between massive neutrinos and a departure from a w = -1, flat geometry.
Publication Date: 15-Dec-2015
Electronic Publication Date: 23-Dec-2015
Citation: Allison, R, Caucal, P, Calabrese, E, Dunkley, J, Louis, T. (2015). Towards a cosmological neutrino mass detection. PHYSICAL REVIEW D, 92 (10.1103/PhysRevD.92.123535
DOI: doi:10.1103/PhysRevD.92.123535
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.

Items in OAR@Princeton are protected by copyright, with all rights reserved, unless otherwise indicated.