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gr-qc2004★ 7 cited
Algebraic and differential Rainich conditions for symmetric trace-free tensors of higher rank
G. Bergqvist, P. Lankinen
We study Rainich-like conditions for symmetric and trace-free tensors T. For arbitrary even rank we find a necessary and sufficient differential condition for a tensor to satisfy t…
gr-qc2004★ 23 cited
Unique characterization of the Bel-Robinson tensor
G. Bergqvist, P. Lankinen
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 symme…