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Do the Ricci and energy-momentum tensors have "duality'' in the context of their Lie symmetries?
Ricci energy-momentum tensors
2010/12/20
The Ricci and energy-momentum tensors have the same algebraic sym-metries. In the Einstein equations they look “dual” to each other, in that interchang-ing them and inverting the gravitational couplin...
Review Article - Classification of Energy Momentum Tensors in n ≥ 5 Dimensional Space-times: A Review
Energy Momentum Tensors n ≥ 5 Dimensional Space-times
2010/10/21
Recent developments in string theory suggest that there might exist extra spatial dimensions, which are not small nor compact. The framework of a great number of brane cosmological models is that in w...