RT Journal Article
T1 Semilocal strings and monopoles
A1 Ruiz Ruiz, Fernando
A1 Samols, T.M.
A1 Ortiz, M.E.
A1 Gibbons, G.W.
AB 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.
PB Elsevier Science BV
SN 0550-3213
YR 1992
FD 1992-10-19
LK https://hdl.handle.net/20.500.14352/59046
UL https://hdl.handle.net/20.500.14352/59046
LA eng
NO 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.
NO SERC
NO Commission of the European Communities
DS Docta Complutense
RD 22 abr 2025