If I had a perfect fluid I could write the stress energy tensor in the rest frame of the fluid as a nice diagonal tensor with [rho,p,p,p] and use this to solve the field equations.(adsbygoogle = window.adsbygoogle || []).push({});

Pressure is just random internal motions, so what happens if all the particles in my perfect fluid decide to move to the left? Clearly, now I could transofrm into a rest frame with T=[rho,0,0,0] and this would suggest that the resulting spacetime structure we get would be different?

Is this correct?

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# Perfect fluid, stress energy tensor in the rest frame,

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