Abstract
Following a brief derivation of the Kalb-Ramond action from an abelian Higgs model, we analyze the dynamics of global strings. We explicitly show that the strings is immersed in its Goldstone boson background field and not in vacuum. This then leads to a configuration dependent Lorentz-like force which opposes the tension. Nevertheless, the resultant force is dominated by the tension and the global string is shown to behave similarly to a Nambu string. This result is confirmed by the dispersion law of small excitations around an axisymmetric string in a U(1) field theory. We elaborate on the similarities and differences between global strings and superfluid vortices.
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