Non-linear quantum dynamics in strong and short electromagnetic fields

TL;DR

This paper reviews non-linear quantum processes in strong, short electromagnetic fields, emphasizing how pulse shape and intensity influence electron-positron pair production and photon emission, with multi-photon interactions dominating at high intensities.

Contribution

It provides a comparative overview of two key quantum processes in intense laser fields, highlighting the transition from pulse-dependent to multi-photon dominated regimes.

Findings

Pulse shape and duration significantly affect process probabilities at low intensities.

Multi-photon interactions dominate at high intensities, determining all aspects of particle production.

High-intensity regimes are characterized by complete multi-photon involvement in quantum processes.

Abstract

In our contribution we give a brief overview of two widely discussed quantum processes: electron-positron pairs production off a probe photon propagating through a polarized short-pulsed electromagnetic (e.m.) (e.g.\ laser) wave field or generalized Breit-Wheeler process and a single a photon emission off an electron interacting with the laser pules, so-called non-linear Compton scattering. We show that at small and moderate laser field intensities the shape and duration of the pulse are very important for the probability of considered processes. However, at high intensities the multi-photon interactions of the fermions with laser field are decisive and completely determined all aspects of subthreshold electron-positron pairs and photon production