The black hole information paradox is a theoretical dilemma in physics that arises from the intersection of quantum mechanics and general relativity. It involves the question of whether information that falls into a black hole is lost forever or whether it can be recovered in some way.
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The black hole information paradox is the apparent conflict between unitary quantum evolution and the semiclassical prediction that complete black-hole evaporation leaves only thermal Hawking radiation. A resolution must explain how information is preserved or why one of the assumptions behind the conflict fails.