Vortex Formations from Domain Wall Annihilations in Two-component Bose-Einstein Condensates

TL;DR

This paper investigates how vortex formations occur during the collision of domain walls in two-component Bose-Einstein condensates, drawing parallels to string theory phenomena and analyzing how initial conditions affect vortex properties.

Contribution

It introduces a theoretical model linking domain wall collisions in Bose-Einstein condensates to tachyon condensation and vortex formation, highlighting the dependence on initial wall separation.

Findings

Vortex line density depends on initial wall separation.

Core size of vortices varies with initial conditions.

Collision process mimics tachyon condensation in string theory.

Abstract

We theoretically study the vortex formation from the collision of the domain walls in phase-separated two-component Bose-Einstein condensates. The collision process mimics the tachyon condensation for the annihilation of D-brane and anti-D-brane in string theory. A pair annihilation leaves the quantized vortices with superflow along their core, namely `superflowing cosmic strings'. It is revealed that the line density and the core size of the vortices depend on the initial distance between the walls.