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New electromagnetic memories and soft photon theorems
In this paper, we present a new type of electromagnetic memory. It is a
`magnetic' type, or B mode, radiation memory effect. Rather than a residual
velocity, we find a position displacement of a charged particle induced by the
B mode radiation with memory. We find two types of electromagnetic displacement
(ordinary and null). We also show that the null electromagnetic memory formulas
are nothing but a Fourier transformation of soft photon theorems.Comment: v2: interpretation improved and typos fixed, refs adde
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