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Stephen Hawking's discovery of black hole evaporation had the remarkableconsequence that information is destroyed by a black hole, which can only beaccommodated by modifying the laws of quantum mechanics. Different attempts toevade the information loss paradox were subsequently suggested, apparentlywithout a satisfactory resolution of the paradox. On the other hand, theattempting to include non-unitarity into quantum mechanics might lead to lawspredicting observable consequences such as nonlocality or violation ofenergy-momentum conservation; but it may be possibly to circumvent theseobstacles. Recent developments seem to require a different view on quantumgravity and suggest that ideas about locality in physics and Hawking'ssemi-classical approximation are misleading. An accurate description may showunitary evolution and no information loss after all.

Does black-hole evaporation imply that physics is non-unitary, and if so, what must the laws of physics look like? An Essay