Should the wave-function be a part of the quantum ontological state?
  We analyze the recent no go theorem by Pusey, Barrett and Rudolph (PBR) concerning ontic and epistemic hidden variables. We define two fundamental requirements for the validity of the result. We finally compare the models satisfying the theorem with the historical hidden variable approach proposed by de Broglie and Bohm. 
A. Drezet
quant-ph