Abstract
The paper contains the necessary and sufficient conditions for a given energy tensor to be interpreted as a sum of two perfect fluids. Given a tensor of this class, the decomposition in two perfect fluids (which is determined up to a couple of real functions) is obtained.
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Ferrando, J.J., Morales, J.A. & Portilla, M. Two-perfect fluid interpretation of an energy tensor. Gen Relat Gravit 22, 1021–1032 (1990). https://doi.org/10.1007/BF00757813
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DOI: https://doi.org/10.1007/BF00757813