Speaker
Description
We perform a hierarchical simulation-based inference analysis of beyond the Standard Model (BSM) neutrino interactions affecting the propagation of high-energy astrophysical neutrinos over cosmological distances. We solve the full cosmological transport equation, including Hubble expansion, energy redistribution, regeneration, and possible resonant scattering, and fit to the diffuse astrophysical neutrino spectrum measured by IceCube.
We jointly infer interaction parameters together with astrophysical source properties including the injection spectrum and redshift evolution allowing us to map degeneracies between intrinsic source curvature and propagation induced distortions. This framework quantifies the robustness of existing coupling constraints to uncertainties in source evolution and explores the regions of parameter space where cosmological propagation effects may be distinguishable from smooth astrophysical models.
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