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Quantum reflection of photons off spatio-temporal electromagnetic field inhomogeneities
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We reconsider the recently proposed nonlinear QED effect of quantum reflection of photons off an inhomogeneous strong-field region. We present new results for strong fields varying both in space and time. While such configurations can give rise to new effects such as frequency mixing, estimated reflection rates based on previous one-dimensional studies are corroborated. On a conceptual level, we critically re-examine the validity regime of the conventional locally-constant-field approximation and identify kinematic configurations which can be treated reliably. Our results further underline the discovery potential of quantum reflection as a new signature of the nonlinearity of the quantum vacuum.
Forward citations
Cited by 2 Pith papers
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Back-reflection in dipole fields and beyond
Back-reflection in dipole fields is dominated by a four-wave-mixing channel; an optimized three-pulse planar setup gives ~1.5 discernible signal photons per shot with signal-to-background ~10^5.
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Impact of background field localization on vacuum polarization effects
For Lorentzian background fields with d localized directions, the strong-field scaling of QED vacuum polarization and pair production depends on d, while weak-field scaling does not.
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