Lensing Properties of Lightlike Current Carrying Cosmic Strings

Details Lensing Properties of Lightlike Current Carrying Cosmic Strings Lensing Properties of Lightlike Current Carrying Cosmic Strings

1994-03-12

arxiv.org/abs/gr-qc/9403025v1

Class.Quant.Grav.11:1743-1762,1994

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

21 pages, LaTeX-REVTeX, 7 figures available upon request, preprint # DAMTP-R94/10

Scientific paper

10.1088/0264-9381/11/7/012

The lensing properties of superconducting cosmic strings endowed with a time dependent pulse of lightlike current are investigated. The metric outside the core of the string belongs to the $pp$--wave class, with a deficit angle. We study the field theoretic bosonic Witten model coupled to gravity, and we show that the full metric (both outside and inside the core) is a Taub-Kerr-Shild generalization of that for the static string with no current. It is shown that the double image due to the deficit angle evolves in an unambiguous way as a pulse of lightlike current passes between the source and the observer. Observational consequences of this signature of the existence of cosmic strings are briefly discussed.

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