Shadow-charge detectability in large-scale neutrino detectors

Very recent works predict the existence of a new type of "particle" that has rich phenomenology and carries profound implications for our understanding of the early universe. Furthermore, it could represent a fraction of the dark matter density. The so-called shadow charges leverage a fundamental principle: classical laws of physics are a mere limit of the deeper quantum mechanical laws. This simple argument has deep consequences, such as the existence of a "shadow" charge density that follows geodesics independently of any surrounding matter fields. We propose that this charged radiation can produce light when passing through a medium like the Earth, similarly to an infinitely massive ion. We provide an analytical study of their interactions in the South-Pole ice for direct application in the IceCube detector and trivial adaptation to any water-based experiment such as KM3NeT. Moreover, we present and discuss very first constraints on the shadow charge parameter space. Finally, we discuss the impact of a screening effect on their interaction with matter.