Theory Seminar (High Energy/Cosmology) |
Events During the Week of April 3rd through April 10th, 2022
Monday, April 4th, 2022
- No events scheduled
Tuesday, April 5th, 2022
- No events scheduled
Wednesday, April 6th, 2022
- No events scheduled
Thursday, April 7th, 2022
- No events scheduled
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