phase velocity @ arXiv
1 Enhanced Electromagnetic Memory, Jann Zosso
Reference
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[31] See [30] for a causal interpretation of this statement.
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[35] The crucial difference to Cherenkov radiation is that the actual production of memory radiation only occurs during the acceleration process of the source.
[36] Note that for a simultaneous emission of multiple current pulses in different directions, the results in section II can simply be stacked. Therefore, an emission of opposite currents in a dipole antenna, for instance, would result in a memory production, in which the features of Fig. 2 are mirrored at θ= π/2 with opposite signs.
[37] To get a feeling for the values ∆AT ∼ 102 − 104[Vs/m] in SI units presented in Fig. 2, consider the following estimates: At length scales of meters, the time scales of the experiment will be of nanoseconds, such that a typical current of 10−3[A] carries a charge of order q∼ 10−12[C]. With these numbers, a two-orders-of-magnitude gain in the potential amplitude lifts the expected strength of the electric field from Emax ∼ q 100 [C] [ns] [Vs/m]∼ 10−1 [V/m] to 10 [V/m].
[38] The idealized situation of a charge emitted at constant velocity vq considered in this work is indeed an excellent model of β-decay [40, 41].
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2 Inhomogeneous plane waves in attenuative anisotropic porous media
Lingli Gao, Weijian Mao, Qianru Xu, Wei Ouyang, Shaokang Yang, Shijun Cheng
https://arxiv.org/pdf/2506.20389
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