Lorentz symmetry group, retardation and energy transformations in a relativistic engine

Shailendra Rajput, Asher Yahalom, Hong Qin

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


In a previous paper, we have shown that Newton’s third law cannot strictly hold in a distributed system of which the different parts are at a finite distance from each other. This is due to the finite speed of signal propagation which cannot exceed the speed of light in vacuum, which in turn means that when summing the total force in the system the force does not add up to zero. This was demonstrated in a specific example of two current loops with time dependent currents, the above analysis led to suggestion of a relativistic engine. Since the system is effected by a total force for a finite period of time this means that the system acquires mechanical momentum and energy, the question then arises how can we accommodate the law of momentum and energy conservation. The subject of momentum conservation was discussed in a pervious paper, while preliminary results regarding energy conservation where discussed in some additional papers. Here we give a complete analysis of the exchange of energy between the mechanical part of the relativistic engine and the field part, the energy radiated from the relativistic engine is also discussed. We show that the relativistic engine effect on the energy is 4th-order in1c and no lower order relativistic engine effect on the energy exists.

Original languageEnglish
Article number420
Issue number3
StatePublished - Mar 2021


  • Electromagnetism
  • Newton’s third law
  • Relativity


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