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Theory Seminar (High Energy/Cosmology)

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Events During the Week of April 3rd through April 10th, 2022

Monday, April 4th, 2022

No events scheduled

Tuesday, April 5th, 2022

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Wednesday, April 6th, 2022

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Thursday, April 7th, 2022

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Friday, April 8th, 2022

Hot Qubits on the Horizon
Time: 1:00 pm
Place: Chamberlin 5280
Speaker: Greg Kaplanek, McMaster University, Perimeter Institute
Abstract: Perturbation theory for gravitating quantum systems tends to fail at very late times (a type of perturbative breakdown known as secular growth). We argue that gravity is best treated as a medium/environment in such situations, where reliable late-time predictions can be made using tools borrowed from quantum optics. To show how this works, we study the explicit example of a qubit hovering just outside the event horizon of a Schwarzschild black hole (coupled to a real scalar field) and reliably extract the late-time behaviour for the qubit state. At very late times, the so-called Unruh-DeWitt detector is shown to asymptote to a thermal state at the Hawking temperature.
Host: George Wojcik
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