From vacuum field equations on principal bundles to Einstein equations with fluids
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In the present work we show that the Einstein equations on $M$ without cosmological constant and with perfect fluid as source, can be obtained from the field equations for vacuum with cosmological constant on the principal fibre bundle $P(\frac{1}{I} M,U(1))$, $M$ being the space-time and $I$ the radius of the internal space $U(1)$.
7 pages, Latex, 0 figures
7 pages, Latex, 0 figures