Semilocal Strings and Monopoles
نویسنده
چکیده
A variation on the abelian Higgs model, with SU(2) global × U(1) local symmetry broken to U(1) global , was recently shown by Vachaspati and Achúcarro [1] to admit stable, finite energy cosmic string solutions even though the mani-fold of minima of the potential energy does not have non-contractible loops. Here we describe the most general solutions in the Bogomol'nyi limit, both in the single vortex case and the multi-vortex case. The single vortex solution depends on one complex parameter and coincides with that of Hindmarsh [2]; it may be regarded as a hybrid of a Nielsen-Olesen vortex and a CP 1 lump. The gravitational field of the vortices considered as cosmic strings is also obtained. Finally, monopole-like solutions interpolating between a Dirac monopole and a global monopole surrounded by an event horizon are found.
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تاریخ انتشار 1992