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| Description | Speaker: Alberto Nicolis Title: An Analog of the Cosmological Constant Problem: Vacuum Energy in Framids Room: 3024 Zoom: https://zoom.us/j/186024391 Host: Markus Luty Abstract: The near vanishing of the cosmological constant is one of the most puzzling open problems in theoretical physics. I will consider a system, the so-called framid, that features a technically similar problem. Its stress-energy tensor has a Lorentz-invariant expectation value on the ground state, yet there are no standard, symmetry-based selection rules enforcing this, since the ground state spontaneously breaks boosts. I will describe how we verified the Lorentz invariance of the expectation value in question with explicit one-loop computations, and how these yield the expected result only thanks to highly nontrivial cancellations, which are quite mysterious from the low-energy effective theory viewpoint. |
| Date | Mon, February 14, 2022 |
| Time | 1:30pm-3:00pm PST |
| Duration | 1 hour 30 minutes |
| Access | Public |
| Created by | High-Energy Seminars |
| Updated | Fri, February 11, 2022 9:44am PST |
