  At present there is good agreement between the neutrino mass-squared
difference determined from the solar neutrino data and the anti-neutrino
mass-squared difference determined from the KamLAND reactor anti-neutrino
experiment. However, the central values of the two cases differ from each other
by about $10^{-5}$ eV$^2$. An improvement in the accuracy of both the solar
neutrino experiments and reactor anti-neutrino experiments can establish the
existence of a non-zero difference between neutrino and anti-neutrino
mass-squared differences and provide a signal for CPT violation. In this paper,
we show how such a difference can arise through the CPT violating neutrino mass
terms from Planck scale physics.

High Energy Physics - Phenomenology