Symmetry and equivalence in Szekeres models

We solve for all Szekeres metrics that have a single Killing vector. For quasihyperboloidal (e = -1) metrics, we find that translational symmetries are possible, but only in metrics that have shell crossings somewhere, while metrics that can be made free of shell crossings only permit rotations. The quasiplanar metrics (e = 0) either have no Killing vectors, or they admit full planar symmetry. Single symmetries in quasispherical metrics (e = +1) are all rotations. The rotations correspond to a known family of axially symmetric metrics, which for each. value, are equivalent to each other. We consider Szekeres metrics in which the line of dipole extrema is required to be geodesic in the 3-space and show the same set of families emerges. We investigate when two Szekeres metrics are physically equivalent and complete a previous list of transformations of the arbitrary functions.