Abstract
The detection of the high-energy neutrino event, IceCube-170922A, demonstrated that multimessenger particle astrophysics triggered by neutrino alerts is feasible. We consider time delay signatures caused by secret neutrino interactions with the cosmic neutrino background and dark matter and suggest that these can be used as a novel probe of neutrino interactions beyond the standard model (BSM). The tests with BSM-induced neutrino echoes are distinct from existing constraints from the spectral modification and will be enabled by multimessenger observations of bright neutrino transients with future experiments such as IceCube-Gen2, KM3Net, and Hyper-Kamiokande. The constraints are complementary to those from accelerator and laboratory experiments and powerful for testing various particle models that explain tensions prevailing in the cosmological data.
Highlights
The detection of the high-energy neutrino event, IceCube-170922A, demonstrated that multimessenger particle astrophysics triggered by neutrino alerts is feasible
We consider time delay signatures caused by secret neutrino interactions with the cosmic neutrino background and dark matter and suggest that these can be used as a novel probe of neutrino interactions beyond the standard model (BSM)
The significance of the association with the flaring blazar TXS 0506 þ 056 is only ∼3σ, this flaring blazar was observed at various wavelengths [5], including x rays [6] and GeV-TeV γ rays [7], which demonstrated the capability of multimessenger observations initiated by high-energy neutrino observations
Summary
The detection of the high-energy neutrino event, IceCube-170922A, demonstrated that multimessenger particle astrophysics triggered by neutrino alerts is feasible. The detection of the high-energy neutrino event, IceCube-170922A [5], gave further motivation for time domain particle astrophysics. Even if statistics are not large, e.g., N ν ∼ a few, the sizable effect of BSM interactions exists if the optical depth to the neutrino scattering is larger than unity, τν 1⁄4 nνσνD ≳ 1: ð3Þ
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