Breakdown of the mechanism of forming wakes by a current-carrying string

Abstract

In this letter we emphasize the effect that the inclusion of electromagnetic properties for a string brings logarithmic divergences to the accretion problem and the mechanism of formation and evolution of wakes can break down.

Dilatonic, Chiral Cosmic Strings

“…In particular, models with a timelike-type or a spacelike-type currents can present divergences leading to unbounded gravitational effects [8,9].…”

“…The combination of both conducting properties of a string and the modified gravity (in particular, the scalar-tensor models) is, of course, of real interest in astrophysics and cosmology and has been treated elsewhere [7,8,9]. The most noticeable effect was point out by Peter, Guimarães and Andrade [10] in which the (gravitational) scalar field 2 behaves as a winding phase along the string, thereby generating a neutral current kind of effect by raising the degeneracy between the eigenvalues of the stress-energy tensor.…”

On the Contributions From Dilatonic Strings to the Flat Behavior of the Rotational Curves in Galaxies

“…1 In the scalar-tensor theories, these relations are modified by a term which depend on the dilaton [9,10].…”

“…In a number of papers [5][6][7][8][9][10][11], a current has been included in the internal structure of the cosmic string. The most noticeable consequence of a current-like effect is to modify the internal dynamics of cosmic strings in such a way that new states are reachable.…”

“…In this section we will mainly review the obtention of the gravitational field generated by a string carrying a current of timelike-type as presented in the Refs. [10].…”