2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/36049Solutions to the field equations of the Nonsymmetric Gravitational Theory with $g_[i0] = 0$ are obtained for the homogeneous, plane-symmetric, time-dependent case, both in vacuum and in the presence of a perfect fluid. Cosmological consequences include a dependence of the speed of light on its polarisation, as in a birefringent crystal.13 pages, TeX, no figureGeneral Relativity and Quantum Cosmologytext