1302.2412 (Lau Loi So)
Lau Loi So
Within a quasilocal 2-surface, describing the non-negative gravitational energy-momentum in terms of the pure Bel-Robinson type 4-momentum, the Bel-Robinson tensor $B$ and tensor $V$ are desirable. The Bel-Robinson type 4-momentum implies causality but the converse is not true. Both $\{B,V\}$ satisfy causality. We find that causality can be obtained either $\{B,V\}$ plus tensor $S$ in small sphere or evaluate $\{B,V\}$ from small box region.
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http://arxiv.org/abs/1302.2412
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