Inspecial relativity,hidden momentum orhidden mechanical momentum is the mechanicalmomentum (mass times velocity) that is unaccounted for byNewtonian mechanics. The concept of "hidden momentum" has been used in answering "paradoxes" inelectromagnetism and other problems, including the Shockley–James paradox,[1] the Mansuripur paradox,[2] and theAharonov–Casher effect.[3]However, these paradoxes have resolution without introducing hidden momentum.
Several mechanisms for hidden momentum are proposed inResource Letter EM-1: Electromagnetic Momentum.[4] However, none of these mechanismshave rigorous derivations or are effective inreplacing the electromagnetic momentum of charge-current distributions.[5]. There is no evidence that Hidden Momentum actually exists.
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