Quantum-gravity-induced dual lensing and IceCube neutrinos

Momentum-space curvature, which is expected in some approaches to the quantum-gravity problem, can produce dual redshift, a feature which introduces energy dependence of the travel times of ultrarelativistic particles, and dual lensing, a feature which mainly affects the direction of observation of particles. In our recent paper [Phys. Lett. B 761 (2016) 318, arXiv:1605.00496.], we explored the possibility that dual redshift might be relevant in the analysis of IceCube neutrinos, obtaining results which are preliminarily encouraging. Here, we explore the possibility that also dual lensing might play a role in the analysis of IceCube neutrinos. In doing so, we also investigate issues which are of broader interest, such as the possibility of estimating the contribution by background neutrinos and some noteworthy differences between candidate "early neutrinos" and candidate "late neutrinos".