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  1. The Hawking Information Loss Paradox: The Anatomy of a Controversy.Gordon Belot, John Earman & Laura Ruetsche - 1999 - British Journal for the Philosophy of Science 50 (2):189-229.
    Stephen Hawking has argued that universes containing evaporating black holes can evolve from pure initial states to mixed final ones. Such evolution is non-unitary and so contravenes fundamental quantum principles on which Hawking's analysis was based. It disables the retrodiction of the universe's initial state from its final one, and portends the time-asymmetry of quantum gravity. Small wonder that Hawking's paradox has met with considerable resistance. Here we use a simple result for C*-algebras to offer an argument for pure-to-mixed state (...)
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