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[tex] T_{AB} = (P + \rho) u_A u_B + P g_{AB} [/tex]

queation1 : always [tex]u_A =1, \vec{0}? [/tex]

question2: if the space time have a line element [tex] h_{AB}dx^A dx^B[/tex]...for the calculus of [tex]T_{AB}[/tex], [tex]¿ g_{AB} = h_{AB}?[/tex]

¿can i to use [tex]g_{AB}=\eta_{AB}[/tex] if [tex]h_{AB} \neq \eta_{AB}?[/tex]