On space-times admitting shear-free, irrotational, geodesic null congruences
A. M. Sintes, A. A. Coley, D. J. McManus
Abstract
Space-times admitting a shear-free, irrotational, geodesic null congruence are studied. Attention is focused on those space-times in which the gravitational field is a combination of a perfect fluid and null radiation.
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