Near-future discovery of point sources of ultra-high-energy neutrinos

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. They account detector energy and angular response, critical, but uncertain backgrounds. Sources declination $-45^\circ$ to $0^\circ$ will be easiest discover. Discovering even one steady-state source 10 years imply that has an luminosity least larger than about $10^{43}$ erg/s (depending on redshift evolution). no transient disfavor brighter $10^{53}$ erg as dominant. results aim inform design upcoming detectors.