Does Schwinger's value for the current of created pairs gets modified for long and strong enough pulse?

TL;DR

This paper investigates how the predictions of Schwinger's pair-creation current are affected by varying pulse strength and duration, identifying conditions where the original theory may not hold.

Contribution

It provides a detailed analysis of the parametric regimes where Schwinger's formula for pair creation is modified by pulse characteristics.

Findings

Schwinger's current prediction is altered under certain pulse conditions.

Long and strong pulses can significantly modify pair-creation probabilities.

The study delineates the parameter space where Schwinger's original prediction remains valid.

Abstract

We determine the parametric conditions (pulse strength and duration) under which Schwinger's prediction for the pair-creation current - and therefore the probability - is significantly altered.