Long-term dynamics of cosmological axion strings
Long-term dynamics of cosmological axion strings
复制标题
宇宙轴子弦的长期动力学
DOI：
10.1093/ptep/pty098
复制
发表时间：
2018
影响因子：
3.5
通讯作者：
Yokoyama Jun’ichi
中科院分区：
文献类型：
--
作者：
Kawasaki Masahiro;Sekiguchi Toyokazu;Yamaguchi Masahide;Yokoyama Jun’ichi
我们提出了一个新的宇宙学轴子弦，这是比以前的8倍长的场论模拟的结果。我们在Hiramatsu et al. [Phys. Rev. D83，123531（2011）]中对物理弦的模拟进行了升级，包括网格数量和分析套件。这些改进使我们能够在有史以来最长的时间内监测表征物理弦网络动力学的各种量。我们的扩展模拟表明，全球字符串不根据标度解的演变，但它的标度参数，或每个视界的长字符串的数量，随时间的推移而增加。此外，我们还发现标度参数对Peccei-Quinn对称性的破缺标度具有非平凡的依赖性。
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 simulation of physical strings in Hiramatsu et al. [Phys. Rev. D83, 123531 (2011)] in terms of the number of grids as well as the suite of analyses. 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.