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Dynamics of junctions and the multitension velocity-dependent one-scale model

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


The dynamics of string junctions and their influence on the evolution of cosmic superstring networks are studied in full detail. We review kinematic constraints for colliding strings in a Friedmann-Lemaitre-Robertson-Walker background and obtain the average distribution of possible string configurations after string collisions. The study of small-scale structure enables us to investigate the average growth/reduction rate of string junctions for a given cosmic string network. Incorporating the averaged junction dynamics into the velocity-dependent one-scale model for multitension string networks, we improve the semianalytic description and quantitative understanding of cosmic superstring network evolution.

Astrophysics - Cosmology and Nongalactic Astrophysics; High Energy Physics - Phenomenology

Physical Review D
Volume 99, Issue 6
2019 March

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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 COMPETE 2020 PORTUGAL 2020 União Europeia