期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2016/02/008
关键词
neutrino masses from cosmology; cosmological parameters from CMBR; CMBR polarisation; reionization
资金
- MEXT KAKENHI [15H05889, 15H05891]
- JSPS KAKENHI [26105520, 26247042, 26220709]
- Center for the Promotion of Integrated Science (CPIS) of Sokendai [1HB5804100]
- Grants-in-Aid for Scientific Research [15H05889, 15H05891, 26220709, 26247042, 26105520] Funding Source: KAKEN
Observations of the 21 cm line radiation coming from the epoch of reionization have a great capacity to study the cosmological growth of the Universe. Besides, CMB polarization produced by gravitational lensing has a large amount of information about the growth of matter fluctuations at late time. In this paper, we investigate their sensitivities to the impact of neutrino property on the growth of density fluctuations, such as the total neutrino mass, the effective number of neutrino species (extra radiation), and the neutrino mass hierarchy. We show that by combining a precise CMB polarization observation such as Simons Array with a 21 cm line observation such as Square kilometer Array (SKA) phase 1 and a baryon acoustic oscillation observation (Dark Energy Spectroscopic Instrument:DESI) we can measure effects of non-zero neutrino mass on the growth of density fluctuation if the total neutrino mass is larger than 0.1 eV. Additionally, the combinations can strongly improve errors of the bounds on the effective number of neutrino species sigma(N-nu) similar to 0.06 - 0.09 at 95 % C.L.. Finally, by using SKA phase 2, we can determine the neutrino mass hierarchy at 95 % C.L. if the total neutrino mass is similar to or smaller than 0.1 eV.
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