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Page states what unitarity requires of the radiation

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Don Page pointed out that if evaporation is unitary, the entanglement entropy of the emitted radiation must rise while the hole is large, turn over at roughly the halfway point, and return to zero when the hole is gone. Hawking's calculation produces a curve that only rises. The Page curve turned a philosophical disagreement into a quantitative target: any proposed resolution has to reproduce a specific shape, and for twenty-six years none did from within gravity itself.

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