Unique characterization of the Bel-Robinson tensor
arXiv:gr-qc/0403024 · doi:10.1088/0264-9381/21/14/012
Abstract
We prove that a completely symmetric and trace-free rank-4 tensor is, up to sign, a Bel-Robinson type tensor, i.e., the superenergy tensor of a tensor with the same algebraic symmetries as the Weyl tensor, if and only if it satisfies a certain quadratic identity. This may be seen as the first Rainich theory result for rank-4 tensors.
extended version, 13 pages, shorter version published in Class.Quant.Grav
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