  We consider the Schwinger effect in confining phase by using a holographic
setup. The potential analysis is performed for the confining D3-brane and
D4-brane backgrounds. We find the critical electric field above which there is
no potential barrier and the system becomes unstable catastrophically. An
intriguing point is that no Schwinger effect occurs when the electric field is
smaller than the confining string tension.

High Energy Physics - Theory