Title: On the measurement problem, decoherence and the language of Quantum Mechanics
Abstract: We discuss in this talk the measurement problem in Quantum Mechanics, and the question of whether or not decoherence provides a solution to it. We point out that Quantum Mechanics is best understood in a weakly objective language rather than in a strongly objective realist one where things are described as they "really" are, independently of observations. We show that arguments referring to decoherence are of no help if it is insisted that nature must be described in terms of a strongly objective description. Decoherence, however, does provide an answer to the measurement problem if such an insistence is dropped. We also examine the envariance formalism of Zurek which derives the Born rule without the use of the density operator, avoiding any circularity. We argue that in this case too, only a weakly objective description can be given. Finally, we briefly comment on some of the recent attempts within quantum cosmology that attempt to provide a strongly objective description of decoherence.
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