Magnetically-enhanced open string pair production

TL;DR

This paper investigates how electric and magnetic fluxes on D3 branes influence open string pair production, revealing a significant enhancement under specific flux configurations and brane separations at the string scale.

Contribution

It introduces a novel analysis of flux interactions on D3 branes, demonstrating enhanced open string pair production due to combined electric and magnetic flux effects.

Findings

Enhanced pair production rate when electric fluxes are nearly identical.

Maximum enhancement occurs with opposite magnetic flux directions.

Significant effects observed at string-scale brane separations.

Abstract

We consider the stringy interaction between two parallel stacks of D3 branes placed at a separation. Each stack of D3 branes in a similar fashion carry an electric flux and a magnetic flux with the two sharing no common field strength index. The interaction amplitude has an imaginary part, giving rise to the Schwinger-like pair production of open strings. We find a significantly enhanced rate of this production when the two electric fluxes are almost identical and the brane separation is on the order of string scale. This enhancement will be largest if the two magnetic fluxes are opposite in direction. This novel enhancement results from the interplay of the non-perturbative Schwinger-type pair production due to the electric flux and the stringy tachyon due to the magnetic flux, and may have realistic physical applications.