European Space Agency 's Planck Satellite survey and ESO Kilo Degree Survey indicates clumpy matter is throughout the universe. Our universe is inhomogeneous clumps. But, in order to solve the equations of Einstein's general relativity, main stream cosmologists assumes that matter is uniformly distributed across space, which is required that the pressure in the universe is a constant (no matter positive or negative).
The pressure should not be a constant as our universe is lumped, it should be different with matter density.
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