Colorful boojums at the interface of a color superconductor

Abstract

We study junctions of vortices, or boojums, at the interface between color and hadronic superconducting/superfluid phases. This type of interface could be present in the interior of neutron stars, where an inner core made of quark matter in the color-flavor-locked phase is surrounded by an outer shell of superconducting protons and superfluid neutrons. We study the fate of magnetic (proton) and superfluid (neutron) vortices as they enter the color-flavor locked phase. We find that proton vortices terminate on Dirac monopoles of the massless magnetic field, and magnetic fluxes of massive gauge field spread along the surface and are screened by surface superconducting currents. On the other hand, three neutron vortices join at a boojum and split into three color magnetic vortices which host confined color-magnetic monopoles when strange quark mass is taken into account. We also present a simple numerical model of the shape of the neutron boojum.

13 pages, 4 figures

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• Topological confinement of vortices in two-flavor dense QCD
• Chiral non-Abelian vortices and their confinement in three flavor dense QCD
• Higgs-confinement continuity and matching of Aharonov-Bohm phases
• Alice meets Boojums in neutron stars: vortices penetrating two-flavor quark-hadron continuity
• Topological interfaces crossed by defects and textures of continuous and discrete point group symmetries in spin-2 Bose-Einstein condensates
• Chiral non-Abelian vortex molecules in dense QCD
• Chiral non-Abelian domain walls in the Ginzburg-Landau theory
• Classification of Magnetic Vortices by Angular Momentum Conservation