113 research outputs found
Current-Carrying Cosmic Strings in Scalar-Tensor Gravities
We study the modifications on the metric of an isolated self-gravitating
bosonic superconducting cosmic string in a scalar-tensor gravity in the
weak-field approximation. These modifications are induced by an arbitrary
coupling of a massless scalar field to the usual tensorial field in the
gravitational Lagrangian. The metric is derived by means of a matching at the
string radius with a most general static and cylindrically symmetric solution
of the Einstein-Maxwell-scalar field equations. We show that this metric
depends on five parameters which are related to the string's internal structure
and to the solution of the scalar field. We compare our results with those
obtained in the framework of General Relativity.Comment: 23 pages, no figures, LATEX fil
Exact solutions of (n + 1)-dimensional Yang-Mills equations in curved space-time
In the context of a semiclassical approach where vectorial gauge fields can
be considered as classical fields, we obtain exact static solutions of the
SU(N) Yang-Mills equations in a dimensional curved space-time, for the
cases . As an application of the results obtained for the case
, we consider the solutions for the anti-de Sitter and Schwarzschild
metrics. We show that these solutions have a confining behavior and can be
considered as a first step in the study of the corrections of the spectra of
quarkonia in a curved background. Since the solutions that we find in this work
are valid also for the group U(1), the case is a description of the
electrodynamics in presence of a point charge. For this case, the
solution has a confining behavior and can be considered as an application of
the planar electrodynamics in a curved space-time. Finally we find that the
solution for the case is invariant under a parity transformation and has
the form of a linear confining solution.Comment: 14 page
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