BBGKY kinetic approach for ane−e+γplasma created from the vacuum in a strong laser-generated electric field: The one-photon annihilation channel

Abstract

In the present work a closed system of kinetic equations is obtained from the truncation of the Bogoliubov-Born-Green-Kirkwood-Yvon hierarchy for the description of the vacuum creation of an electron-positron plasma and secondary photons due to a strong laser field. This truncation is performed in the Markovian approximation for the one-photon annihilation channel which is accessible due to the presence of the strong external field. Estimates of the photon production rate are obtained for different domains of laser field parameters (frequency $\ensuremath{\nu}$ and field strength $E$). A huge quantity of optical photons of the quasiclassical laser field is necessary to satisfy the conservation laws of the energy and momentum of the constituents (${e}^{\ensuremath{-}}$, ${e}^{+}$ and $\ensuremath{\gamma}$) in this channel. Since the number of these optical photons corresponds to the order of perturbation theory, a vanishingly small photon production rate results for the optical region and strongly subcritical fields $E\ensuremath{\ll}{E}_{c}$. In the $\ensuremath{\gamma}$-ray region $\ensuremath{\nu}\ensuremath{\lesssim}m$ the required number of laser photons is small and the production rate of photons from the one-photon annihilation process becomes accessible to observations for subcritical fields $E\ensuremath{\lesssim}{E}_{c}$. In the infrared region the photon distribution has a $1/k$ spectrum typical for flicker noise.