Spinning-off stringy electro-magnetic memories
Alice Aldi, Massimo Bianchi, Maurizio Firrotta

TL;DR
This paper extends string corrections to electromagnetic memory effects in Type I superstring theory, incorporating spin effects, non-perturbative corrections, and potential observable signals in semi-classical states.
Contribution
It generalizes EM memory corrections to Type I superstrings, including spin effects and non-perturbative $\alpha'\$ corrections, and discusses potential experimental detection.
Findings
Corrections are non-perturbative in $\alpha'\$ and decay as 1/R at large distances.
Spin N states induce N derivatives on the amplitude with respect to retarded time.
Possible detection of string memory signals in semi-classical coherent states.
Abstract
We extend and generalise the string corrections to the EM memory to the Type I superstring including spin effects. Very much as in the simpler bosonic string context, the relevant corrections are non-perturbative in , slowly decaying (as ) at large distances and modulated in retarded time . For spin states in the first Regge trajectory they entail a sequence of derivatives wrt on the `parent' amplitude. We also briefly discuss how to include loop effects, that broaden and shift the string resonances, and how to modify our analysis for macroscopic semi-classical quasi-BPS coherent states, whose collisions may lead to detectable string memory signals in viable Type I models.
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