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Homework Statement
"Texbooks that describe perfect fluids are often a little unclear about what is being assumed. It may not be immediately obvious why can't the pressures be different in different directions? Let's examine this. Suppose Tαβ = diag(ρ,(1+ε)P,P,P) . Show that if one performs a rotation around the z axis by an angle phi that the stress energy tensor picks up off diagonal components of order εP."
What rotation matrix should I be using, it's coordinate dependent isn't it?
Homework Equations
The Attempt at a Solution
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