GRAVITATIONAL ANYON

We show that, in the (2 + 1)-dimensional Einstein gravity without the Chern-Simons term, the topological interaction of a point source with or without spin necessarily makes the composite state of the source and neutral test particle a gravitational anyon. In particular for a massless spinning source with spin-sigma, the angular momentum l of the gravitational anyon is given by l = n - sigma-E/2-pi, where E is the energy and n is an integer.