Early-universe 'Little Red Dots' proposed as source of mysterious high-energy neutrinos

A study published in Physical Review D proposes that Little Red Dots, compact, unusually red objects discovered in large numbers in the early universe by the James Webb Space Telescope, may be the source of high-energy neutrinos detected by the IceCube Observatory since 2013. The researchers, led by Riku Kuze of Kyoto University, posit that at least some LRDs host rapidly growing supermassive black holes surrounded by a dense gas envelope that absorbs or reprocesses X-ray, ultraviolet, radio, and gamma-ray emission. This 'cocooned' picture explains why LRDs appear bright in infrared while remaining faint at wavelengths typically used to identify energetic black-hole activity. The gas envelope could also serve as a target for cosmic-ray interactions that produce the high-energy neutrinos IceCube has observed. The true physical nature of LRDs remains uncertain, but the cocooned-black-hole interpretation accounts for several unusual observational properties.