Forecast for weighing neutrinos in cosmology with SKA
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August 2020 Vol. 63 No. 8: 280411 https://doi.org/10.1007/s11433-019-1516-y
Forecast for weighing neutrinos in cosmology with SKA Jing-Fei Zhang1, Bo Wang1, and Xin Zhang1,2,3* 2 Ministry
1 Department of Physics, College of Sciences, Northeastern University, Shenyang 110819, China; of Education’s Key Laboratory of Data Analytics and Optimization for Smart Industry, Northeastern University, Shenyang 110819, China; 3 Center for High Energy Physics, Peking University, Beijing 100080, China
Received November 11, 2019; accepted January 21, 2020; published online April 13, 2020
We investigate what role the SKA neutral hydrogen (HI) intensity mapping (IM) and galaxy sky surveys will play in weighing neutrinos in cosmology. We use the simulated data of the baryon acoustic oscillation (BAO) measurements from the HI surveys based on SKA1 (IM) and SKA2 (galaxy) to do the analysis. For the current observations, we use the Planck 2015 cosmic microwave background (CMB) anisotropies observation, the optical BAO measurements, the type Ia supernovae (SN) observation (Pantheon compilation), and the latest H0 measurement. We consider three mass ordering cases for massive neutrinos, i.e., the normal hierarchy (NH), inverted hierarchy (IH), and degenerate hierarchy (DH) cases. It is found that the SKA observation can significantly improve the constraints on Ωm and H0 . Compared to the current observation, the SKA1 data can improve the constraints on Ωm by about 33%, and on H0 by about 36%; the SKA2 data can improve the constraints on Ωm by about 58%, and ∑ on H0 by about 66%. It is also found that the SKA observation can only∑slightly improve the constraints on mν . Compared to the current observation, the SKA1 data can improve the constraints on mν by about 4%, 3%, and 10%, for the NH, IH, and ∑ DH cases, respectively; the SKA2 data can improve the constraints on mν by about 7%, 7%, and 16%, for the NH, IH, and DH cases, respectively. 21 cm observation, intensity mapping survey, Square Kilometre Array, baryon acoustic oscillations, neutrino mass PACS number(s): Citation:
95.36.+x, 98.80.Es, 98.80.-k
J.-F. Zhang, B. Wang, and X. Zhang, Forecast for weighing neutrinos in cosmology with SKA, Sci. China-Phys. Mech. Astron. 63, 280411 (2020), https://doi.org/10.1007/s11433-019-1516-y
1 Introduction Precise measurement of cosmological parameters is one of the core tasks of cosmology research. The answers to almost all important scientific questions in cosmology depend on precise measurements of cosmological parameters. The measurement of cosmological parameters is closely related to the cosmological model because the determination of cosmological parameters is usually done by fitting observational data under the assumption of a specific cosmological model. After decades of development, the study of cosmology has
entered the era of precision cosmology. At present, a standard model of cosmology has been basically established, of which the prototype is the so-called Λ cold dark matter (ΛCDM) model. The bas
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