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Forecast for weighing neutrinos in cosmology with SKA

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Abstract

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 ∑mv. Compared to the current observation, the SKA1 data can improve the constraints on ∑mv by about 4%, 3%, and 10%, for the NH, IH, and DH cases, respectively; the SKA2 data can improve the constraints on ∑mv by about 7%, 7%, and 16%, for the NH, IH, and DH cases, respectively.

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Authors and Affiliations

  1. Department of Physics, College of Sciences, Northeastern University, Shenyang, 110819, China

    Jing-Fei Zhang, Bo Wang & Xin Zhang

  2. Ministry of Education’s Key Laboratory of Data Analytics and Optimization for Smart Industry, Northeastern University, Shenyang, 110819, China

    Xin Zhang

  3. Center for High Energy Physics, Peking University, Beijing, 100080, China

    Xin Zhang

Authors
  1. Jing-Fei Zhang
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  2. Bo Wang
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Correspondence to Xin Zhang.

Additional information

This work was supported by the National Natural Science Foundation of China (Grant Nos. 11875102, 11835009, 11975072, 11690021, and 11522540), the Liaoning Revitalization Talents Program (Grant No. XLYC1905011), the Fundamental Research Funds for the Central Universities (Grant No. N2005030), and the National Program for Support of Top-Notch Young Professionals.

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Zhang, JF., Wang, B. & Zhang, X. 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

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