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Röntgen Momentum
The Röntgen momentum, Röntgen interaction energy and Röntgen current are features of the overall translational motion of any aggregate of charges [1]. The Röntgen interaction ensures energy-momentum conservation and gauge invariance of radiation-induced mechanical forces. In the dipole approximation, the Röntgen momentum is equal to the cross-product of the dipole moment d and the magnetic flux density B(R) evaluated at the centre of mass R of the charge aggregate.
References
[1] C. Baxter, M. Babiker, R. Loudon, “Canonical Approach to Photon Pressure” Phys. Rev.A, 47, 1278 (1993).
Work in progress
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