Eternal black holes are the ultimate cosmic safes:
Hsu realised that running the process backwards would be equivalent to a black hole forming and then existing in a perfect vacuum, with no Hawking radiation. "It becomes a black hole that's not radiating, which is a very weird thing," Hsu says.
The snag is that to run this process backwards and make the eternal black hole, you would need to send in a precisely crafted burst of radiation as the hole forms. The radiation would have to be "exactly tuned to interfere with the Hawking radiation that would otherwise come out", says Hsu.
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