In references [141, 143, 139, 140, 145, 144, 138, 142] the author has attempted to argue that vorticity can be related to
the concept of torsion in a general affine connexion. We disagree. Although deriving a wave equation in the presence of
vorticity very definitely moves one beyond the realm of a simple Riemannian spacetime, adding torsion to the connexion is not
sufficient to capture the relevant physics.