Abstract
Perfect-fluid, diagonal G2 spacetimes admitting a (proper) inheriting conformal Killing vector (ICKV) are studied. A result which specifies the possible form of an ICKV (under certain physical conditions) in such a spacetime is proven, and then used to determine all (physically admissible) diagonal G2 perfect-fluid ICKV spacetimes. In particular, all such spacetimes in which the perfect fluid satisfies a barotropic equation of state, , , and in which the ICKV is proper, are explicitly found.
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