  The topological structure of the order parameter in Zhang's SO(5) theory of
superconductivity allows for an unusual type of dissipation mechanism via which
current-carrying states can decay. The resistivity due to this mechanism, which
involves orientation rather than amplitude order-parameter fluctuations, is
calculated for the case of a thin superconducting wire. The approach is a
suitably modified version of that pioneered by Langer and Ambegaokar for
conventional superconductors.
