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| Description | Speaker: Sam Homiller Title: Zero Modes of Massive Fermions and Axion Strings Room: 3024 Host: John Terning Abstract: Axion strings have been the subject of a renewed interest in recent years, both as fundamental objects in higher-dimensional gauge theories, and as topological solitons that can play an important phenomenological role in Cosmology. It is well known that massless chiral excitations can arise between a fermion and an axion string, propagating along the string and allowing it to superconduct. The properties of these excitations, or zero modes, dictate how the string interacts with light and can thus have important phenomenological consequences. In this talk, I’ll revisit the story of these zero modes, and discuss how this story changes when a nowhere-vanishing Dirac mass for the fermion is added to the usual low-energy theory of axion electrodynamics. Using analytic, numerical and theoretical arguments, I will show that the zero modes exhibit an interesting phase structure, in which they delocalize from the string core as the mass increases, up until a critical value past which they disappear. |
| Date | Mon, May 6, 2024 |
| Time | 1:30pm-3:00pm PDT |
| Duration | 1 hour 30 minutes |
| Access | Public |
| Created by | High-Energy Seminars |
| Updated | Thu, April 25, 2024 8:54am PDT |
| Send Reminder | Yes - 0 days 6 hour 0 minutes before start |
