Journal Article

Constraints on the neutrino mass and mass hierarchy from cosmological observations

Huang, Qing-Guo, Wang, Sai, Wang, Ke

2016

Overview

Considering the mass splitting between three active neutrinos, we represent the new constraints on the sum of neutrino mass ∑ m ν by updating the anisotropic analysis of the Baryon Acoustic Oscillation (BAO) scale in the CMASS and LOWZ galaxy samples from Data Release 12 of the SDSS-III Baryon Oscillation Spectroscopic Survey (BOSS DR12). Combining the BAO data of 6dFGS, MGS, LOWZ and CMASS with Planck  2015 data of temperature anisotropy and polarizations of the Cosmic Microwave Background (CMB), we find that the 95 % C.L. upper bounds on ∑ m ν refer to ∑ m ν , N H < 0.18 eV for the normal hierarchy (NH), ∑ m ν , I H < 0.20 eV for the inverted hierarchy (IH) and ∑ m ν , D H < 0.15 eV for the degenerate hierarchy (DH), respectively, and the normal hierarchy is slightly preferred over the inverted one ( Δ χ 2 ≡ χ NH 2 - χ IH 2 ≃ - 3.4 ). In addition, the additional relativistic degrees of freedom and massive sterile neutrinos are neither favored at present.

• Publisher: Springer Berlin Heidelberg,Springer,Springer Nature B.V
• Subject: Analysis / Anisotropy / Astronomy / Astrophysics and Cosmology / Cosmic background radiation / Elementary Particles / Hadrons / Heavy Ions / Measurement Science and Instrumentation / Nuclear Energy / Nuclear Physics / Physics / Physics and Astronomy / Quantum Field Theories / Quantum Field Theory / Regular Article - Theoretical Physics / String Theory