Key points are not available for this paper at this time.
For a certain class of three-manifolds, the angular momentum of an asymptotically flat quantum gravitational field can have half-integral values.Received 11 February 1980DOI:https://doi.org/10.1103/PhysRevLett.44.1100©1980 American Physical Society
Friedman et al. (1980) studied this question.