It is just for simplicity to call PμA a four-momemtum. P μA is not defined (general, nor even Lorentz) covariantly nor as a volume integral of tensor density of weight − 1. The integrand Λ μν is a tensor density of weight − 2. In Section 6.1, we will find that P μA equals √ − gmAu μA in a certain sense. PτA is an energy of the star (modulo the contribution from the integrand χμναβ,αβ) if the star considered were isolated, the space-time is asymptotically flat, and finally, if we integrate over a spacelike hypersurface, rather than integrate only over the body zone of the star [115].