Perfect fluids are idealized models in which these possibilities are neglected.
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A related concept is the perfect fluid equation of state used in cosmology.
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Specifically, perfect fluids have no shear stresses, viscosity, or heat conduction.
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The RHIC experiments also discovered that this matter is in fact strongly interacting and nearly a perfect fluid.
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For a perfect fluid, another equation of state relating density \ rho and pressure p must be added.
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For such fluids, specific heats and \ gamma are assumed to be constant and invariant with temperature ( a thermally perfect fluid ).
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With the stress energy tensor for a perfect fluid, we substitute them into Einstein's field equations and the resulting equations are described below.
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Perfect fluids admit a Lagrangian formulation, which allows the techniques used in field theory, in particular, quantization, to be applied to fluids.
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Perfect fluids are often used in general relativity to model idealized distributions of matter, such as the interior of a star or an isotropic universe.
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When the energy-momentum tensor represents a perfect fluid, every Killing vector field preserves the energy density, pressure and the fluid flow vector field.
