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Photon propagation in slowly varying inhomogeneous electromagnetic fields
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Starting from the Heisenberg-Euler effective Lagrangian, we determine the photon current and photon polarization tensor in inhomogeneous, slowly varying electromagnetic fields. To this end, we consider background field configurations varying in both space and time, paying special attention to the tensor structure. As a main result, we obtain compact analytical expressions for the photon polarization tensor in realistic Gaussian laser pulses, as generated in the focal spots of high-intensity lasers. These expressions are of utmost importance for the investigation of quantum vacuum nonlinearities in realistic high-intensity laser experiments.
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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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