In a recent article [1], Mansuripur has claimed that inside the matter conventional Lorentz Force law should be abandoned in favour of a more general expression of the electromagnetic force density such as the one discovered by A. Einstein and J.Laub in 1908. The main focus of Mansuripur's claim is based on special theory of relativity. According to [1], Lorentz force law is incompatible with special theory of relativity. In this article, we have focused in favour of Einestien-Laub equations (Force law; associated stress tensor, momentum density, Poynting vector etc) from quite different point of views. Especially we have tried to include previously/recently reported experimental observations, Abraham-Minkowski -Nelson controversy, Quantum Electrodynamics and most importantly the significance of associated stress tensors to judge the problem from a broader and engineering point of view. At the end of the day, considering all the issues, we have found that only Einestien-Laub 'equations' can predict the actual total force inside the matter and probably consistent with all other laws of Electrodynamics.
We develop a QED approach to find the contribution of the quantum vacuum to the electromagnetic Abraham force. Semi-classical theories predict diverging contributions from the quantum vacuum.We show that the divergencies disappear by Kramers-Bethe mass-renormalization. The finite remainder is compared to the relativistic corrections to the Abraham force. This work generalizes an earlier paper [1], dedicated to the harmonic oscillator, to the hydrogen atom and corrects two subtle errors.
We consider the non-radiative resonant energy transfer from a two-dimensional Wannier exciton (donor) to a Frenkel exciton of a molecular crystal overlayer (acceptor). We characterize the effect of the optical anisotropy of the organic subsystem on this process. Using realistic values of material parameters, we show that it is possible to change the transfer rate within typically a factor of two depending on the orientation of the crystalline overlayer. The resonant matching of donor and acceptor energies is also partly tunable via the organic crystal orientation.
We investigate the transition from unbanded to banded spherulitic growth in mixtures of ethylene carbonate with polyacrylonitrile. By carefully considering systematic errors, we show that the band spacing diverges with a power-law form showing scaling over nearly two decades. We also observe that the bands disorder as the transition point is approached. The critical exponent is nonclassical. One possible explanation is that the nonequilibrium transition is actually weakly first order (subcritical).
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