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Yu Hamada: Knotted comic strings in particle physics models

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mardi 11 juin 2024 mardi 11 juin 2024
+ Google Map Salle 318 (IMB)

Cosmic strings (or vortex strings) are topological defects arising when U(1) symmetry is spontaneously broken in quantum field theories. In three-dimensional relativistic systems, loops of cosmic strings are known to be unstable because of their trivial topological charges. In this talk, I will show that a new stable solution of classical EOMs exists in the form of a knot (or link) consisting of two kinds of cosmic string loops. The key mechanism is the Chern-Simons coupling between the « axion » and gauge field, which gives electric charges to the knot.


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