Semilocal strings and monopoles



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Ruiz Ruiz, Fernando and Samols, T.M. and Ortiz, M.E. and Gibbons, G.W. (1992) Semilocal strings and monopoles. Nuclear Physics B, 385 . pp. 127-144. ISSN 0550-3213

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A variation on the abelian Higgs model, with SU(2)global x U(1)local symmetry broken to U(1)global, was recently shown by Vachaspati and Achucarro to admit stable, finite-energy cosmic string solutions, even though the manifold of minima of the potential energy does not have non-contractible loops. This new and unexpected feature motivates a full investigation of the properties of the model. Here we exploit the existence of first-order Bogomol'nyi equations to classify all static finite-energy vortex solutions in the Bogomol'nyi limit. We find a 4n-dimensional moduli space for the nth topological (n-vortex) sector. Single-vortex configurations depend on a position coordinate and on an additional complex parameter and may be regarded as hybrids of Nielsen-Olesen vortices and CP1 lumps. The model is also shown to obey Bogomol'nyi equations in curved space, and these allow a simple calculation of the gravitational field of the above configurations. Finally, monopole-like solutions interpolating between a Dirac monopole and a global monopole are found. These must be surrounded by an event horizon as isolated solutions, but may also arise as unstable end points of semi-local strings.

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Copyright © 1992 Published by Elsevier B.V.
We would like to thank Ana Achúcarro, Mark Hindmarsh, Nick Manton and Tanmay Vachaspati for helpful discussions. MEO wishes to thank the SERC for financial support. FRR was supported by The Commission of the European Communities through contract No. SC1000488 with The Niels Bohr Institute.

Uncontrolled Keywords:Cosmic Strings, Global Monopole, Scattering, Equations, Motion, Model, 1ST
Subjects:Sciences > Physics
ID Code:25425
Deposited On:13 May 2014 15:06
Last Modified:20 May 2014 08:53

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