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There are several proposals that model electrons as BHs. For example, A. Burinskii proposes a spinning soliton on a Kerr-Newman BH geometry (enhanced to an MIT bag model in “New path to unification of gravity with particle physics”, arXiv:1701.01025 (2016)). In such models, the electron's high spin enhances the strong gravitational field required for a BH. Frame dragging is enhanced by a high spin rate. As shown in “Gravitational redshift in Kerr-Newman geometry" (AK Dubey and AK Sen, Astrophysics and Space Science (2015)), frame dragging varies with azimuthal angle in this geometry. They also establish the corresponding variation in gravitational redshift for a ray of light emitted radially outward. If a spin polarized beam of electrons is subject to intense acceleration, the consequent bremsstrahlung radiation should exhibit such azimuthal variation in its frequency spectrum. Might a facility such as the Extreme Light Infrastructure (ELI-ALPS) with ultrashort laser pulses and a high repetition rate provide such evidence, given sufficient replication?

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