Speaker
Description
Sterile neutrinos with mass in the eV-scale and large mixings
of order θ_0 ≃ 0.1 could explain some anomalies found in
short-baseline neutrino oscillation data. We consider
a neutrino portal scenario in which eV-scale sterile neutrinos
have self-interactions via a new gauge vector boson φ. Their
production in the early Universe via mixing with active
neutrinos can be suppressed by the induced effective potential
in the sterile sector. We study how different cosmological
observations can constrain this model, in terms of the mass
of the new gauge boson, Mφ, and its coupling to sterile
neutrinos, g_s. We explore how to probe part of the
allowed parameter space of this particular model with future
observations of the diffuse supernova neutrino background by
the Hyper-Kamiokande and DUNE detectors. For Mφ ∼ 5 − 10 keV
and g_s ∼ 10^(−4) − 10^(−2), as allowed by cosmological constraints,
we find that interactions of diffuse supernova neutrinos with
relic sterile neutrinos on their way to the Earth would result
in significant dips in the neutrino spectrum which would
produce unique features in the event spectra observed in these
detectors.
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