Black holes live forever, at least according to general relativity. Once material crosses a black hole's event horizon, it is trapped forever, until the last day of cosmic time. But we know that isn't true. General relativity is a classical model.…
Black holes evaporate through Hawking radiation, meaning their days are numbered. But a new study finds they could enter a metastable stage where they look similar to white holes.
A link between particle physics and gravity equations, called the double copy, applies to Hawking radiation, creating a new way into black hole puzzles.
