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Bach tensor : ウィキペディア英語版
Bach tensor
In differential geometry and general relativity, the Bach tensor is a trace-free tensor of rank 2 which is conformally invariant in dimension .〔Rudolf Bach, "Zur Weylschen Relativitätstheorie und der Weylschen Erweiterung des Krümmungstensorbegriffs", ''Mathematische Zeitschrift'', 9 (1921) pp. (110 ).〕 Before 1968, it was the only known conformally invariant tensor that is algebraically independent of the Weyl tensor.〔P. Szekeres, Conformal Tensors. Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences
Vol. 304, No. 1476 (Apr. 2, 1968), pp. (113 )–122〕 In abstract indices the Bach tensor is given by
:B_ = P__b}^d+\nabla^c\nabla_aP_-\nabla^c\nabla_cP_
where ''W'' is the Weyl tensor, and ''P'' the Schouten tensor given in terms of the Ricci tensor ''R_'' and scalar curvature ''R'' by
:P_=\frac\left(R_-\fracg_\right).
==See also==

*Cotton tensor
*Obstruction tensor

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