2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/187094According to standard quantum theory, the time evolution operator of a quantum system is independent of the state of the system. One can, however, consider systems in which this is not the case: the evolution operator may depend on the density operator itself. The presence of such modifications of quantum theory can be tested in long baseline oscillation experiments.8 pages, LaTeX; no macros neededHigh Energy Physics - Phenomenologytext