Yu Hamada: Knotted comic strings in particle physics models

Salle 318 (IMB)

Salle 318



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.