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VOLUME 70 (1999) | ISSUE 12 | PAGE 776
Monopole, half-quantum vortices and nexus in chiral superfluids and superconductors
PACS: 14.80.Hv, 67.57.Fg
Two exotic objects are still not identified experimentally in chiral superfluids and superconductors. These are the half-quantum vortex, which plays the part of the Alice string in relativistic theories [1] (A.S.Schwarz, Nucl. Phys. B208, 141 (1982)), and the hedgehog in the Ϊ field, which is the counterpart of the Dirac magnetic monopole. These two objects of different dimensionality are topologically connected. They form the combined object which is called nexus [2] (John M.Cornwall, hep-th/9911125; Phys. Rev. D69, 125015 (1999); Phys. Rev. D58,105028 (1998)) or center monopole [3] (N.N.Chernodub, M.LPolikarpov, A.I.Veselov and M.A.Zubkov, Nucl. Phys. Proc. Suppl. 73, 575 (1999)) in relativistic theories. Such combination will allow us to observe half-quantum vortices and monopoles in several realistic geometries.