  We review the boson transformation method to deal with spontaneous symmetry
breaking in quantum field theory, focussing on how it describes the emergence
of extended and classical objects in such quantum context. We then apply the
method to the emergence of space itself, as an extended and classical object
resulting from the evaporation of a quantum black hole. In particular, we show
how classical torsion and curvature tensors can emerge as effects of an
inhomogeneous Nambu-Goldstone boson condensation in vacuum, in E(3) invariant
spinor models with symmetry breaking.
