Gravitational field around a screwed superconducting cosmic string in scalar-tensor theories

V. B. Bezerra; C. N. Ferreira

doi:10.1103/PhysRevD.65.084030

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Gravitational field around a screwed superconducting cosmic string in scalar-tensor theories

V. B. Bezerra, C. N. Ferreira

DOI 10.1103/PhysRevD.65.084030 · Physical Review D

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Abstract

We obtain the solution that corresponds to a screwed superconducting, bosonic cosmic string (SSCS) in the framework of a general scalar-tensor theory including torsion, using the weak field approximation. We investigate the metric of the SSCS in Brans-Dicke theory with torsion and analyze the case without torsion. We show that in the case with torsion the space-time background presents other properties different from those in which torsion is absent. When the spin vanishes, this torsion is a φ gradient and then it propagates outside of the string. We investigate the effect of torsion on the gravitational force and on the geodesics of a test particle moving around the SSCS. The accretion of matter by wakes formation when a SSCS moves with a speed v is investigated. We compare our results with those obtained for cosmic strings in the framework of scalar-tensor theory.