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INSTITUTO POLITÉCNICO NACIONAL - Instituto Avanzado de ...

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1.1. RELATIVIDAD GENERAL Y ESPECIAL 15Algunas propieda<strong>de</strong>s <strong>de</strong>l tensor <strong>de</strong> curvatura sonR abcd = R abdc = R bacd ; (1.25)R abcd = R cdab; (1.26)yR abcdje + R abecjd + R ab<strong>de</strong>jc = 0; (1.27)que son las i<strong>de</strong>ntida<strong>de</strong>s <strong>de</strong> Bianchi 12 .De…nimos el tensor <strong>de</strong> Ricci comoR ab = R i aib; (1.28)y el escalar <strong>de</strong> Ricci o simplemente curvatura comoR = g ab R ab : (1.29)Finalmente, jugaremos un poco con las i<strong>de</strong>ntida<strong>de</strong>s <strong>de</strong> Bianchi. Multiplicandog bc por 1.27,g bc [R abcdje + R abecjd + R ab<strong>de</strong>jc ] = 0; (1.30)R adje + R aejd + R c a<strong>de</strong>jc = 0; (1.31)12 X i jq = @Xi@x q + i pqX p la <strong>de</strong>rivada parcial covariante.

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