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arXiv · 1611.04438

Afterglow of the dynamical Schwinger process: soft photons amass

Andreas Otto·Burkhard Kämpfer
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Abstract

We consider the conversion of an electric field into photons as a secondary probe of the dynamical Schwinger process. In spatially homogeneous electric fields, quantum fluctuations of electron-positron ($e^+e^-$) pairs are lifted on the mass shell leaving asymptotically a small finite pair density. The $e^+e^-$ dynamics in turn couples to the quantized photon field and drives its on-shell mode occupation. The spectral properties of the emerging asymptotic photons accompanying the Schwinger process are calculated in lowest-order perturbation theory. Soft photons in the optical range are produced amass in the sub critical region, thus providing a promising discovery avenue, e.g. for laser parameters of the Extreme Light Initiative (ELI-NP) to be put in operation soon.

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Andreas Otto, Burkhard Kämpfer. 2016-11-14. Afterglow of the dynamical Schwinger process: soft photons amass. https://doi.org/10.1103/physrevd.95.125007

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