Mattia Cipriani, Walter Vinci, Muneto Nitta
We study junctions of vortices, or boojums, at the interface between color and hadronic super- conducting/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. Neutron vortices, on the other hand, 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 modelization of the shape of the neutron boojum.
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http://arxiv.org/abs/1208.5704
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