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Thought Experiment Dilemma (1/2)


Gravity binds to energy-momentum OR electric charge is conserved (not both).



All the rest mass of 1 particle becomes the kinetic energy of 5 others.

If gravity is a function of the rest mass only, then the system accelerates without any external forces applied.

Therefore gravity is a function of energy-momentum.




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sweetser@alum.mit.edu