Upcoming neutrino telescopes may discover ultra-high-energy (UHE) cosmic neutrinos, with energies beyond 100 PeV, in the next 10-20 years. Finding their sources would identify guaranteed sites of interaction UHE rays, whose origin is unknown. We search for by looking multiplets neutrinos arriving from similar directions. Our forecasts are state-of-the-art, geared at radio-detection IceCube-Gen2...

We study the optical properties of solar gravitational lens (SGL) while treating Sun as an extended, axisymmetric and rotating body. The field is represented using a set zonal harmonics. develop analytical description intensity light that observed in image plane strong interference region realistic SGL. This formalism makes it possible to model not only point-spread function point sources, but ...