The chirality transitions induced by gravitational fields on Dirac particles are studied within the framework of field theory in curved spaces. To have these transitions both a non-null mass for the particle and an angular momentum for the source of the gravitational field are necessary. The results of this analysis are applied to some simple examples, and an upper bound for the corresponding amplitude is estimated.

• Received 30 March 1994

DOI:https://doi.org/10.1103/PhysRevD.50.7425