  A model of a straight superconducting global cosmic string is examined in a
setting wherein the string supports a charge/current pulse described by a
travelling wave along the string. Linearized field equations are obtained for
fluctuations of the scalar and vector fields of the theory, and a set of
approximate particular solutions are found for the case in which the linear
charge density and the current of the string have equal magnitudes. Although
the equations of motion seem to suggest that the scalar and vector excitation
fields are massive inside the string core, the particular solutions show that
they behave as effectively massless fields which propagate at the speed of
light along the string along with the primary charge/current pulse. The effect
of the mass parameter is to modulate the radial profile of the excitation
fields. The vector excitation field generates radial and angular components for
both the electric and magnetic fields, but the particular solutions do not
describe the emission or absorption of electromagnetic radiation from the
string.

High Energy Physics - Phenomenology;Astrophysics