Is Purity Eternal?
arXiv:hep-th/9206056 · doi:10.1016/0550-3213(93)90576-B
Abstract
Phenomenological and formal restrictions on the evolution of pure into mixed states are discussed. In particular, it is argued that, if energy is conserved, loss of purity is incompatible with the weakest possible form of Lorentz covariance.
12 pages, in Plain Tex; section 3 on Lorentz covariance expanded and improved in response to year-long correspondence with the referee, but the conclusions are unchanged; UCSBTH-92-22
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