スピーカー：濱田 佑 (KEK)

タイトル：Coleman-Weinberg Abrikosov-Nielsen-Olesen strings

アブストラクト：
Vortex strings are topological solitons in field theories and appear in
various systems, such as superconductor, neutron star, early universe and
so on. We clarify the nature of vortex strings in the Abelian-Higgs-like
model with a Coleman-Weinberg type Higgs potential, which is inspired by
the argument of the naturalness problem in particle physics. This model has
the gauge U(1) symmetry and the classical scale invariance. The model has
no vortex string solution at the classical level, while quantum corrections
spontaneously break the U(1) symmetry and stable vortex strings exist. The
interaction between the two vortex strings is found to be very different
from that of the Abelian-Higgs model with the conventional second- and
fourth-order type potentials. Implications for particle physics and
cosmology are also discussed.