  Recently much progress has been made in applying field theory methods, first
developed to study X-ray edge singularities, to interacting one dimensional
systems in order to include band curvature effects and study edge singularities
at arbitrary momentum. Finding experimental confirmations of this theory
remains an open challenge. Here we point out that spin chains with uniform
Dzyaloshinskii-Moriya (DM) interactions provide an opportunity to test these
theories since these interactions may be exactly eliminated by a gauge
transformation which shifts the momentum. However, this requires an extension
of these X-ray edge methods to the transverse spectral function of the xxz spin
chain in a magnetic field, which we provide.
