Impacts of dark energy on weighing neutrinos: Mass hierarchies considered

Sai Wang, Yi-Fan Wang, Dong-Mei Xia, and Xin Zhang
Phys. Rev. D 94, 083519 – Published 20 October 2016

Abstract

Taking into account the mass splittings between three active neutrinos, we investigate the impacts of dark energy on constraining the total neutrino mass mν by using recent cosmological observations. We consider two typical dark energy models, namely, the wCDM model and the holographic dark energy (HDE) model, which both have an additional free parameter compared with the ΛCDM model. We employ the Planck 2015 data of CMB temperature and polarization anisotropies, combined with low-redshift measurements on BAO distance scales, type Ia supernovae, the Hubble constant, and Planck lensing. Compared to the ΛCDM model, our study shows that the upper limit on mν becomes much looser in the wCDM model but much tighter in the HDE model. In the HDE model, we obtain the 95% confidence level upper limit mν<0.105eV for three degenerate neutrinos. This might be the most stringent constraint on mν by far, and it is on the verge of diagnosing the neutrino mass hierarchies in the HDE model. However, the difference of χ2 is still not significant enough to distinguish the neutrino mass hierarchies, even though the minimal χ2 of the normal hierarchy is slightly smaller than that of the inverted hierarchy.

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  • Received 2 August 2016

DOI:https://doi.org/10.1103/PhysRevD.94.083519

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Gravitation, Cosmology & AstrophysicsParticles & Fields

Authors & Affiliations

Sai Wang1,*, Yi-Fan Wang1,†, Dong-Mei Xia2,‡, and Xin Zhang3,4,§

  • 1Department of Physics, The Chinese University of Hong Kong, Shatin, NT, Hong Kong SAR 999077, China
  • 2College of Power Engineering, Chongqing University, Chongqing 400044, China
  • 3Department of Physics, College of Sciences, Northeastern University, Shenyang 110819, China
  • 4Center for High Energy Physics, Peking University, Beijing 100871, China

  • *physics0911@163.com
  • yfwang@phy.cuhk.edu.hk
  • xiadm@cqu.edu.cn
  • §zhangxin@mail.neu.edu.cn

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Vol. 94, Iss. 8 — 15 October 2016

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