Séminaire / Seminar GReCO |
| « Long-term dynamics of cosmological axion strings » |
|
Masahide Yamaguchi |
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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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lundi 1 octobre 2018 - 11:00 Salle des séminaires Évry Schatzman Institut d'Astrophysique de Paris |
| Pages web du séminaire / Seminar's webpage |