  We examine linear dust acoustic waves (DAWs) in a dusty plasma with strongly
correlated dust grains, and discuss possibility of a twisted DA vortex beam
carrying orbital angular momentum (OAM). For our purposes, we use the Boltzmann
distributed electron and ion density perturbations, the dust continuity and
generalized viscoelastic dust momentum equations, and Poisson's equation to
obtain a dispersion relation for the modified DAWs. The effects of the
polarization force, strong dust couplings, and dust charge fluctuations on the
DAW spectrum are examined. Furthermore, we demonstrate that the DAW can
propagate as a twisted vortex beam carrying OAM. A twisted DA vortex structure
can trap and transport dust particles in dusty plasmas.
