Physics Department Colloquia

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Events on Friday, September 30th, 2022

Black holes and quantum information
Time: 3:30 pm - 4:30 pm
Place: 2241 Chamberlin Hall
Speaker: Tom Hartman, Cornell
Abstract: The black hole information paradox, discovered by Hawking in 1976, is that black hole evaporation seems to violate quantum mechanics by creating too much entropy. I will describe the current status of this problem and discuss recent progress, including a new calculation of the entropy of Hawking radiation that is compatible with unitary quantum mechanics. There are two key ingredients: a link between classical geometry and quantum entanglement, and higher topologies in quantum gravity known as replica wormholes. I will also discuss the prospects for applying similar methods to cosmology in the early universe, which is similar in some ways to the inside of a black hole.
Host: Gary Shiu
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