Probing pseudo-Dirac neutrinos with astrophysical sources at IceCube
Kiara Carloni, Ivan Martínez-Soler, C. Argüelles, K. S. Babu, P. S. Bhupal Dev
Abstract
The recent observation of NGC 1068 by the IceCube Neutrino Observatory has opened a new window to neutrino physics with astrophysical baselines. In this paper, we propose a new method to probe the nature of neutrino masses using these observations. In particular, our method enables searching for signatures of pseudo-Dirac neutrinos with mass-squared differences that reach down to $\ensuremath{\delta}{m}^{2}\ensuremath{\gtrsim}{10}^{\ensuremath{-}21}\text{ }\text{ }{\mathrm{eV}}^{2}$, improving the reach of terrestrial experiments by more than a billion. Finally, we discuss how the discovery of a constellation of neutrino sources can further increase the sensitivity and cover a wider range of $\ensuremath{\delta}{m}^{2}$ values.