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...érielle et gravitationally'' (''Material and Gravitational Electromagnetic Energy''). ...verify or refute the initial claims. The results were negative: no excess energy was observed. ...

...apers, which he now made covariant by the assumption that the trace of the energy-momentum tensor was zero, as it was for electromagnetism. ...ng covariant field equations based on the assumption that the trace of the energy momentum tensor vanished as it did for electromagnetism. ...