Sprecher
Beschreibung
We model the effects of decoherence induced by quantum gravity phenomenologically using an open quantum system framework. In addition to the three known active neutrinos, we allow for an arbitrary number of dark fermion generations, such as particle dark matter or sterile neutrinos. Assuming that quantum gravity is flavour blind, we expect democratic transition probabilities across all neutrinos and dark fermions with respect to gravitational interactions, thus resulting in an equally distributed final flavour ratio in the high-energy limit. Therefore, the damping of neutrino flavour oscillation probabilities as a function of energy and propagation length encodes information about quantum gravity effects and the number of fermion generations in the dark sector. By analysing the SN1987A data, we obtain bounds on gravitationally induced neutrino quantum decoherence.