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Tuesday, 10 December 2019 at 11:15, in Y16 G05 - Campus Irchel
ANITA experiment is an array of radio antennas suspended from a helium balloon in Antarctica designed to measure the highest energy part of the astrophysical neutrino spectrum. After three flights the collaboration reported two events that even though they are consistent with tau cascades, a high energy Standard Model or Beyond the Standard Model explanation is challenging and in tension with other experiments. After introducing the physical properties of the observed events, and imposing low energy physics due to other constraints, I will show how with the help of the ionosphere a pulse of axionic scalar field from the dark sector can produce the observed radio signals.