In this work, we deal with the chiral string model for which the world-sheet current is null in the framework of a scalar-tensor gravity. Our main goal is to analyse the impact of such a current on the gravitational macroscopic effects. For the purpose of this analysis, we first study the gravitational properties of the spacetime generated by this string in the presence of a dilaton field. Then, we carry out an investigation of the mechanism of formation and evolution of wakes in this framework, showing the explicit contribution of the chirality to this effect.
Observational data establish that in large samples of disks galaxies the tangent velocity of tests particles in a coplanar orbit is radii independent. With this knowledge, we construct a theorem that furnishes the geometrical conditions on the metric coefficients of an axisymmetric stationary space-time in order to tests particles to obey these data. After this, we apply this theorem to a dilatonic current-carrying cosmic string and arrive to a constraint on the microscopic gauge model.
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