Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Statut Confirmé
Série SEM-GRECO
Domaines astro-ph
Date Lundi 1 Octobre 2018
Heure 11:00
Institut IAP
Salle Salle des séminaires
Nom de l'orateur Yamaguchi
Prenom de l'orateur Masahide
Addresse email de l'orateur
Institution de l'orateur
Titre Long-term dynamics of cosmological axion strings
Résumé We present the results of a new field-theoretic simulation of cosmological axion strings, which are eight times longer than previous ones. We have upgraded our previous simulation of physical strings in terms of the number of grids as well as the suite of analysis methods. These improvements enable us to monitor a variety of quantities characterizing the dynamics of the physical string network for the longest term ever. Our extended simulations have revealed that global strings do not evolve according to the scaling solution, but that its scaling parameter, or the number of long strings per horizon, increases logarithmically in time. In addition, we have also found that the scaling parameter shows nontrivial dependence on the breaking scale of the Peccei-Quinn symmetry.
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