  We investigate the dynamic structure factor of the antiferromagnetic Kitaev
honeycomb model in a magnetic field by applying perturbative continuous unitary
transformations about the high-field limit. One- and two-quasiparticle
properties of the dressed elementary spin-flip excitations of the high-field
polarized phase are calculated which account for most of the spectral weight in
the dynamic structure factor. We discuss the evolution of spectral features in
these quasiparticle sectors in terms of one-quasiparticle dispersions,
two-quasiparticle continua, the formation of antibound states, and
quasiparticle decay. In particular, a comparably strong spectral feature above
the upper edge of the upmost two-quasiparticle continuum represents three
antibound states which form due to nearest-neighbor density-density
interactions.
