  We study black holes in three-dimensional Chern-Simons gravity with a
negative cosmological constant. In particular, we identify how the Chern-Simons
interactions between a scattering particle and a black hole project the
particle wavefunction onto a wavefunction in the black hole background. We also
analyze the set of space-times that should be allowed in the theory and the way
in which boundary conditions affect the spectrum of space-times.
