On the nonlinear realization of superconformal symmetry

The nonlinear realization of superconformal symmetry in two dimensions is considered. Superconformal symmetry is realized by means of the dimension — 12 Nambu-Goldstone fermion ξ and its dimension 32 conjugate ν. A matter coupling of these Nambu-Goldstone fermions reproduces the realization found by Berkovits and Vafa to show the equivalence between the bosonic string and an N = 1 superstring. This indicates that this equivalence is a result of the super Higgs mechanism as a two dimensional field theory, in which the NG fermions become unphysical.