Schwinger Effect and Entanglement Entropy in Confining Geometries

TL;DR

This paper investigates the Schwinger effect and entanglement entropy in various confining geometries using AdS/CFT, revealing how phase transition rates vary across models and magnetic field orientations.

Contribution

It provides a comparative analysis of pair creation rates and entanglement entropy phase diagrams in four confining supergravity backgrounds, including effects of magnetic fields.

Findings

Higher pair creation rates in Witten QCD and Klebanov-Tseytlin models.

Butterfly-shaped entanglement entropy phase diagrams.

Magnetic fields influence pair creation rates depending on orientation.

Abstract

By using AdS/CFT, we study the critical electric field, the Schwinger pair creation rate and the potential phase diagram for the quark and anti quark in four confining supergravity backgrounds which are the Witten QCD, the Maldacena-Nunez, the Klebanov-Tseytlin and the Klebanov-Strassler models. We compare the rate of phase transition in these models and compare it also with the conformal case. We then present the phase diagrams of the entanglement entropy of a strip in these geometries and find the predicted butterfly shape in the diagrams. We find that the phase transitions have higher rate in WQCD and KT relative to MN and KS. Finally we show the effect of turning on an additional magnetic field on the rate of pair creation by using the imaginary part of the Euler-Heisenberg effective Lagrangian. The results is increasing the parallel magnetic field would increase the pair creation rate and increasing the perpendicular magnetic field would decrease the rate.