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The Stress-Energy-Momentum Tensor is the source of gravity in General Relativity. Momentum, as well as mass, pressure and shear stress are components of that tensor, which represents the flow of energy in every possible direction.
Thereby, is momentum a source of gravity? Meaning that a massive object, travelling close to the speed of light, would have a greater gravitational pull than another object of same mass but no momentum?
Would it be possible, for instance, to accelerate a massive object so close to the speed of light that it becomes a black hole?