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Semianalytic calculation of cosmic microwave background anisotropies from wiggly and superconducting cosmic strings

I. Yu. Rybak, A. Avgoustidis, C. J. A. P. Martins

Abstract
We study how the presence of world-sheet currents affects the evolution of cosmic string networks, and their impact on predictions for the cosmic microwave background (CMB) anisotropies generated by these networks. We provide a general description of string networks with currents and explicitly investigate in detail two physically motivated examples: wiggly and superconducting cosmic string networks. By using a modified version of the CMBact code, we show quantitatively how the relevant network parameters in both of these cases influence the predicted CMB signal. Our analysis suggests that previous studies have overestimated the amplitude of the anisotropies for wiggly strings. For superconducting strings the amplitude of the anisotropies depends on parameters which presently are not well known-but which can be measured in future high-resolution numerical simulations.

Keywords
Astrophysics - Cosmology and Nongalactic Astrophysics, High Energy Physics - Phenomenology

Physical Review D
Volume 96, Issue 1035
2017 November

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Instituto de Astrofísica e Ciências do Espaço Universidade do Porto Faculdade de Ciências da Universidade de Lisboa Fundação para a Ciência e a Tecnologia
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