Superconformal mechanics, black holes, and nonlinear realizations - art. no. 084015

The OSp(2\2)-invariant planar dynamics of a D = 4 superparticle near the ho rizon of a large mass extreme black hole is described by an N = 2 superconf ormal mechanics, with the SO(2) charge being the superparticle's angular mo mentum. The non-manifest superconformal invariance of the superpotential te rm is shown to lead to a shift in the SO(2) charge by the value of its coef ficient, which we identify as the orbital angular momentum. The full SU(1,1 \2) invariant dynamics is found from an extension to N = 4 superconformal m echanics. [S0556-2821(99)01608-2].