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The energy-momentum(EM) tensor T^{µν} derived from the Lagrangian of an interacting gauge field through Noether theorem is gauge dependent and asymmetric. Due to the Einstein equation of general relativity is symmetric in the metric side one usually adds a surface term to obtain gauge invariant and symmetric EM tensor as the dynamical gravity source. The gauge invariant requirement of the decom ... More
Presented by Prof. Fan WANG