Divergence of the Quantum Stress Tensor on the Cauchy Horizon in 2-d   Dust Collapse
  We prove that the quantum stress tensor for a massless scalar field in two dimensional non-selfsimilar Tolman Bondi dust collapse and Vaidya radiation collapse models diverges on the Cauchy horizon, if the latter exists. The two dimensional model is obtained by suppressing angular co-ordinates in the corresponding four dimensional spherical model. 
Sukratu Barve (T.I.F.R.), T.P.Singh (T.I.F.R.) and Cenalo Vaz   (Universidade do Algarve)