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Result of the Neutrino-4 Experiment and the Cosmological Constraints on the Sterile Neutrino (Brief Review)

  • FIELDS, PARTICLES, AND NUCLEI
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We present a short discussion of the Neutrino-4 experimental results and the results of other experiments searching for the sterile neutrino. We estimated the contribution of the sterile neutrino with parameters \(\Delta m_{{14}}^{2} \approx 7.3{\kern 1pt} \) eV2 and \({{\sin }^{2}}2{{\theta }_{{14}}} \approx 0.36\) obtained in the Neutrino-4 experiment to the energy density of the Universe. We address the contradiction between the measured sterile neutrino parameters and the constraints on the sterile neutrino from cosmology. With this article, we want to draw attention to the problem of the contradiction between experiment and theory, in order to inspire the search for theoretical models that include a sterile neutrino with mass in the region of several eV, and to the necessity to sufficiently increase the precision of the experiment.

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ACKNOWLEDGMENTS

We are grateful to V.A. Rubakov, A.D. Dolgov, and Z.G. Berezhiani for advice and comments on the theoretical aspects of this work and to the colleagues at the Petersburg Nuclear Physics Institute and at the Institute for Nuclear Research, Russian Academy of Sciences for useful discussions in seminars.

Funding

The work was supported by the Russian Science Foundation, project no. 20-12-00079.

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Authors and Affiliations

  1. Petersburg Nuclear Physics Institute, National Research Center Kurchatov Institute, 188300, Gatchina, Russia

    A. P. Serebrov, R. M. Samoilov, M. E. Chaikovskii & O. M. Zherebtsov

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  1. A. P. Serebrov
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  2. R. M. Samoilov
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  3. M. E. Chaikovskii
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  4. O. M. Zherebtsov
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Correspondence to A. P. Serebrov.

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Serebrov, A.P., Samoilov, R.M., Chaikovskii, M.E. et al. Result of the Neutrino-4 Experiment and the Cosmological Constraints on the Sterile Neutrino (Brief Review). Jetp Lett. 116, 669–682 (2022). https://doi.org/10.1134/S002136402260224X

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