Decoherence and CPT Violation in Neutrino Oscillations

We present some preliminary results of our study of quantum-gravitational decoherence in a three-neutrino framework. In this context, we discuss the implications of diagonal and non-diagonal decoherence matrices for Dirac and Majorana neutrinos for CPT violation. We find that different choices for the decoherence matrices may lead either to CPT violation or conservation.