Charged cosmic strings interacting with gravitational and electromagnetic waves |
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Authors: | Kostas Kleidis Apostolos Kuiroukidis Polixeni Nerantzi and Demetrios B Papadopoulos |
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Institution: | 1.Department of Physics,Aristotle University of Thessaloniki,Thessaloniki,Greece;2.Department of Mechanical Engineering,Technological Education Institute of Serres,Serres,Greece |
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Abstract: | Under a particular choice of the Ernst potential, we solve analytically the Einstein–Maxwell equations to derive a new exact solution depending on five parameters: the mass, the angular-momentum (per unit mass), α, the electromagnetic-field strength, k, the parameter-p and the Kerr-NUT parameter, l. This (Petrov Type D) solution is cylindrically symmetric and represents the curved background around a charged, rotating
cosmic string, surrounded by gravitational and electromagnetic waves, under the influence of the Kerr-NUT parameter. A C-energy
study in the radiation zone suggests that both the incoming and the outgoing radiation is gravitational, strongly focused
around the null direction and preserving its profile. In this case, the absence of the k-parameter from the C-energy implies that, away from the linear defect the electromagnetic field is too weak to contribute
to the energy-content of the cylindrically symmetric space-time under consideration. In order to explain this result, we have
evaluated the Weyl and the Maxwell scalars near the axis of the linear defect and at the spatial infinity. Accordingly, we
have found that the electromagnetic field is concentrated (mainly) in the vicinity of the axis, while falling-off prominently
at large radial distances. However, as long as k ≠ 1, the non-zero Kerr-NUT parameter enhances those scalars, both near the axis and at the spatial infinity, introducing
some sort of gravitomagnetic contribution. |
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