Dynamics of a vortex dipole in a holographic superfluid

• Verfasst von: Ewerz, Carlo [VerfasserIn]
• Verfasst von: Samberg, Andreas [VerfasserIn]
• Verfasst von: Wittmer, Paul [VerfasserIn]
• Titel: Dynamics of a vortex dipole in a holographic superfluid
• Verf.angabe: Carlo Ewerz, Andreas Samberg and Paul Wittmer
• E-Jahr: 2021
• Jahr: 26 November 2021
• Umfang: 44 S.
• Fussnoten: Gesehen am 22.12.2021
• Titel Quelle: Enthalten in: Journal of high energy physics
• Ort Quelle: Berlin : Springer, 1997
• Jahr Quelle: 2021
• Band/Heft Quelle: (2021), 11, Artikel-ID 199, Seite 1-44
• ISSN Quelle: 1029-8479
• DOI: doi:10.1007/JHEP11(2021)199
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1783513926

Abstract

We use holography to investigate the dynamics of a vortex-anti-vortex dipole in a strongly coupled superfluid in 2+1 dimensions. The system is evaluated in numerical real-time simulations in order to study the evolution of the vortices as they approach and eventually annihilate each other. A tracking algorithm with sub-plaquette resolution is introduced which permits a high-precision determination of the vortex trajectories. With the increased precision of the trajectories it becomes possible to directly compute the vortex velocities and accelerations. We find that in the holographic superfluid the vortices follow universal trajectories independent of their initial separation, indicating that a vortex-anti-vortex pair is fully characterized by its separation. Subtle non-universal effects in the vortex motion at early times of the evolution can be fully attributed to artifacts due to the numerical initialization of the vortices. We also study the dependence of the dynamics on the temperature of the superfluid.