22,143 research outputs found

    Topological current of point defects and its bifurcation

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    From the topological properties of a three dimensional vector order parameter, the topological current of point defects is obtained. One shows that the charge of point defects is determined by Hopf indices and Brouwer degrees. The evolution of point defects is also studied. One concludes that there exist crucial cases of branch processes in the evolution of point defects when the Jacobian D(ϕx)=0D(\frac \phi x)=0.Comment: revtex,14 pages,no figur

    Evolution of the Chern-Simons Vortices

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    Based on the gauge potential decomposition theory and the ϕ\phi -mapping theory, the topological inner structure of the Chern-Simons-Higgs vortex has been showed in detail. The evolution of CSH vortices is studied from the topological properties of the Higgs scalar field. The vortices are found generating or annihilating at the limit points and encountering, splitting or merging at the bifurcation points of the scalar field ϕ.\phi .Comment: 10 pages, 10 figure

    Topology of Knotted Optical Vortices

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    Optical vortices as topological objects exist ubiquitously in nature. In this paper, by making use of the ϕ\phi-mapping topological current theory, we investigate the topology in the closed and knotted optical vortices. The topological inner structure of the optical vortices are obtained, and the linking of the knotted optical vortices is also given.Comment: 11 pages, no figures, accepted by Commun. Theor. Phys. (Beijing, P. R. China

    Conditions for entanglement transformation between a class of multipartite pure states with generalized Schmidt decompositions

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    In this note we generalize Nielsen's marjoization criterion for the convertibility of bipartite pure states [Phys. Rev. Lett \textbf{83}, 436(1999)] to a special class of multipartite pure states which have generalized Schmidt decompositions.Comment: 3 pages (Revetex 4), no figures. A brief note on entanglement transformation. Comments are welcom

    Disclination in Lorentz Space-Time

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    The disclination in Lorentz space-time is studied in detail by means of topological properties of ϕ\phi -mapping. It is found the space-time disclination can be described in term of a Dirac spinor. The size of the disclination, which is proved to be the difference of two sets of su(2)% -like monopoles expressed by two mixed spinors, is quantized topologically in terms of topological invariants-winding number. The projection of space-time disclination density along an antisymmetric tensor field is characterized by Brouwer degree and Hopf index.Comment: Revtex, 7 page

    Angular Momentum Conservation Law for Randall-Sundrum Models

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    In Randall-Sundrum models, by the use of general Noether theorem, the covariant angular momentum conservation law is obtained with the respect to the local Lorentz transformations. The angular momentum current has also superpotential and is therefore identically conserved. The space-like components JijJ_{ij} of the angular momentum for Randall-Sundrum models are zero. But the component J04J_{04} is infinite.Comment: 10 pages, no figures, accepted by Mod. Phys. Lett.

    Angular Momentum of a Brane-world Model

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    In this paper we discuss the properties of the general covariant angular momentum of a five-dimensional brane-world model. Through calculating the total angular momentum of this model, we are able to analyze the properties of the total angular momentum in the inflationary RS model. We show that the space-like components of the total angular momentum of are all zero while the others are non-zero, which agrees with the results from ordinary RS model.Comment: 8 pages; accepted by Chinese Physics

    Generally Covariant Conservative Energy-Momentum for Gravitational Anyons

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    We obtain a generally covariant conservation law of energy-momentum for gravitational anyons by the general displacement transform. The energy-momentum currents have also superpotentials and are therefore identically conserved. It is shown that for Deser's solution and Clement's solution, the energy vanishes. The reasonableness of the definition of energy-momentum may be confirmed by the solution for pure Einstein gravity which is a limit of vanishing Chern-Simons coulping of gravitational anyons.Comment: 12 pages, Latex, no figure
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