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The mysterious `dark energy' needed to explain the current observations,poses a serious confrontation between fundamental physics and cosmology. Thepresent crisis may be an outcome of the (so far untested) prediction of thegeneral theory of relativity that the pressure of the matter source alsogravitates. In this view, a theoretical analysis reveals some surprisinginconsistencies and paradoxes faced by the energy-stress tensor (in thepresence of pressure) which is used to model the matter content of theuniverse, including dark energy.

Einstein's Theory of Gravity in the Presence of Pressure: A Review