Semiclassical Collapse of a Sphere of Dust and Hawking Radiation
  The independent dynamical variables of a collapsing homogeneous sphere of dust are canonically quantised and coupled equations describing matter (dust) and gravitation are obtained. The conditions for the validity of the adiabatic (Born-Oppenheimer) and semiclassical approximations are derived. On neglecting back-reaction effects, it is also shown that in the vicinity of the horizon and inside the dust the Wightman function for a conformal scalar field coupled to a monopole emitter is thermal at the characteristic Hawking temperature. 
Roberto Casadio (Dipartimento di Fisica, Universita' di Bologna and   I.N.F.N., Sezione di Bologna, Italy)